It really isn't that difficult once you get started. Its like problem solving. For example:
"I want coffee. What do I need? Well, I need coffee beans! Got 'em, but they aren't ground. Ok, that means I need a grinder. Cheapest one is $12, but a really classy one that will make your coffee habit a thing ov envy will run you $50 or more. Ok, now I need a coffee maker...Hmmmm....I could get a little plastic thing that holds a paper filter for $6 or I could go with the $368 super-auto-intravenous-drip system..."
The idea is that you start with what you have, then identify what you need. You don't have to make too many choices all at once.
So, if you want to record on your computer...you have to have a computer you can use for recording. Anything will work, but some things work better than others. The computer you are using for the BBS would probably work to get you started, and maybe even to keep you going. What have you got for a computer?
Next up is the soundcard. The card that came with your computer is not going to make you happy for very long BUT there is no reason not to start with it. I started with a cheapo full duplex card and stayed with it for several months while I learned the...
Software. Gotta have it. I started cheap but very good with N-track (PC only). I only used it for about 6 monhts until I upgraded my soundcard, but some people never stop using it.
What I'm saying is your best course, especially if you are feeling confused, is to start with what you have and a very minimal investment. If your computer's soundcard is full duplex (i.e. can play and record at the same time) then all you need is the software, a dynamic mic, and the funky cable arrangement needed to get the XLR mic cable into the mini-plug on your soundcard. Radio Shack can help you there. Or you could use a cheapo mic that has a mini-plug connector.
No, this setup will not sound all that great. The idea is to get you started cheaply so that you no longer feel confused when thinking about what to get next. As you get some experience with computer recording, you'll have a much better idea of what questions to ask and what further investments will make a real impact on the ease and quality of your recordings.
Take care,
Chris