Wow.
I guess I'll take a stab at this.
First things first: what type of music do you play, what instrument, what is the quality of said playing and equipment? I only ask because at this stage of the game, if you are just starting out as a musician, you probably don't want to sink a ton of money into recording. You would be best due to get a decent microphone and something like a 4-track cassette recorder. If you are further along and are looking for expandability and high quality, there are numerous other options.
Also, what kind of budget either do you have or do you want to put into this? You may very well be better off not going the 'buy a computer, interface, software & microphones' route, as that is already a multi-thousand dollar venture.
Do you have some sort of computer now? What are the specs (processor type and speed, hard disk capacity, amount of memory/RAM, etc).
Once these questions are answered, we can stear you in some sort of narrower direction. Because right now we are basically running around in a field of infinite size, completely lost

Hope to hear from ya soon.