"I am in need of a way to keep a lot of extensive notes/journals of which I can access daily. However, I do not want to keep a hand written copy as anyone who happens to find them can read it. I am also concerned about having the notes on a computer file as the file can be hacked or accessed without my consent. I do have an old computer I can use for typing the information (not connected to internet). What alternatives do I have for storing the information?"
You have many alternatives, but the first thing you have to do is decide just how secure your data needs to be, and whom you place your trust in when obtaining secure devices.
There is an old axiom, by Benjamin Franklin I think, that says "Three people can keep a secret, if two of them are dead."
With this in mind, understand that if you are attempting to hide information from three-letter federal agencies, the chances of success are quite small and the methods are beyond anything you'll find here.
If you're trying to protect information from criminals, hackers, snoops and even foreign governments, you have some options, but doing so with certainty requires rather a lot of effort and retraining of your attitudes and habits.
If your concern is more prosaic, and you just want to keep snoops at bay, you have many options.
Recognize that the biggest hole in any security system (or privacy effort for that matter) is YOU, and your family, and your friends. Loose lips sink ships, and that's how most secrets are revealed. When it comes to computers, the biggest mistakes are using unsecure passphrases, giving passphrases out to untrustworthy people, and writing them down. So the first change you have to make is to resolve to keep your secrets SECRET, and take to the grave the passphrases you use to protect your truly valuable information. Never write it down, commit it to memory, make it a secure and lengthy passphrase, and keep it to yourself.
If you do this, for protecting information from casual snooping, almost any off-the-shelf encryption program or system will be sufficient to protect your data. Modern encryption packages are pretty much unbreakable these days so long as you also RETAIN CONTROL OF THE DATA. If someone steals the encrypted data and can work on cracking the password without being detected, only the most sophisticated systems will keep your information safe. So controlling physical access is as important as encryption and secure passwords.
The most effective physical security is the "purloined letter" method where the data appears to be something it's not, some innocuous object that no one would think hides information.
But since you need to access this information daily, that's not really going to be workable.
My best suggestion at this point for keeping computerized data about as safe as you can possibly keep it is to obtain an IronKey USB drive and store all data on this device, and either keep it physically in your possession (not on your keyring) or in a safe when it's not in use.
This device is as secure as any I've found. It encrypts data coming to and from the chip "on the fly" so the data is never left in an unencrypted state except when you're actually viewing it. It also has one unique feature that makes it head-and-shoulders above all the rest; it has an auto-destruct function that physically frys the encryption module if you enter the wrong password ten times in a row. This prevents brute-force cracking attempts in case the device is lost.
In addition, you would want to consider a program called "TrueCrypt" for your computer, which is an on-the-fly encryption program that keeps all data on your computer's hard disc encrypted at all times. It also allows you to create a "hidden partition" on the disk where data can be stored in a manner that, they claim, cannot be distinguished from random data.
Using a computer that is NEVER connected to the Internet (take the telephone modem, wifi and network cards out of the machine completely to avoid temptation and to prevent someone from sneaking in and hooking it up while you're not home) and that you boot up from a removable disk, either a hard disk or DVD with your system files burned onto it as the boot drive, and you've protected against pretty much anything other than a physical attack on your computer (installation of a key logger or other physical monitoring device) or a Tempest attack (monitoring your computer by radio frequency reception), so long as you use good security procedures to make sure that you control the boot disk at all times to prevent copying or inserting of malware or spyware into your system files.
In reality, if all you are doing is using the computer as a typewriter, and you have no need for any of the programs, a simple computer works quite well. Unfortunately, most new operating systems REQUIRE that you connect to the Internet for validation and activation of the software, and Windows will shut down if you do not regularly connect to the Internet so Microsoft can snoop your hard drive to see if you're stealing software. Trust me, ALL major software vendors, particularly OS vendors, insert their own "spyware" in their programs if for no other reason than to keep track of customers, so if you undertake this effort, you have to learn to adapt to not using the Internet AT ALL, EVER with your secure computer. This means that you will have to become a self-educated software expert about YOUR software, because this also means that you can NEVER take your computer into a repair shop for repairs, lest they connect to the internet, which they will, for diagnostic purposes.
You should run an open-source freeware version of Linux or Unix that does not require on-line registration, purchased using a straw man buyer so it's not traceable to you.
You have quite a lot of self-education ahead of you if you truly need to be absolutely secure, so the real question is just how secure you really need to be. You can be "Bourne Agenda" paranoid, or you can be rational about your security needs. Either way, you'll be spending a lot of time on line figuring out your system.
The most important thing to know about ALL encryption systems is that they are either crackable by brute force (which means NSA supercomputers) or they have back doors which allow the government to snoop at will. The only one I know of that doesn't is open-source PGP, and I don't know what the current state of encryption cracking is. I used to keep up with it, but gave up a while back because I no longer had a need to be ultra-secure.
But you can be certain that every encryption program produced in the US, especially those that have a license from the government for export out of the US are crackable by the US government. This is a requirement of obtaining an export license for encryption programs, which are considered "munitions" under federal law, and thus are controlled-export items. Even the IronKey is vulnerable to government decryption. I asked them specifically about export restrictions, and they are only prohibited for export to places like Iran and North Korea and a few others on the "enemies" list. They refused to answer whether or not there is a government/manufacturer "back door" into the system.
This is the problem with any system you use where you have to trust the manufacturer. You simply have no way of knowing if they have a back door or if they are willing to cooperate with federal authorities (or state and local authorities for that matter) if your storage media needs to be unencrypted for national security or criminal reasons. So if you are engaged in anything shady or illegal, know that you're not invulnerable, ever.
Keep in mind also, that any time you reenter the US, Customs has legal authority to copy everything on your computer or drives/storage devices and examine it. Whether they can force you to give up the password is another matter, but if you refuse, they can keep your computer indefinitely. Some people have lost computers for up to 3 months.
So, your travel plans also have to take this into account.
To help you any further, I'd have to know more about what your specific needs are to give you advice on the level of security you might need.