You know, I had a more complicated two-wallet routine all written out for the OP to use. But after re-reading, thinking a bit, and seeing this, I'm just going to say Jan is probably right in that this is all you need.

I'd only add a few points:

- Keep your private key and address in a safe, secure place
- Make at least one copy of the private key and address, and keep it in a separate safe place

Here's a thread that touches on how to make a paper wallet:

https://bitcointalk.org/index.php?topic=213342.0

There's also an Android app, Bitcoin Address Utility Tool, that can help if you have an old smartphone or tablet that you don't keep online constantly. Just jump on wifi, download it, then disconnect before running. If you choose to use it, it requires a passphrase, but I would strongly recommend not trying to make a passphrase you can remember. Instead make it a very long, random string of letters, numbers and symbols that you carefully write down later along with the private key and address.