nickd123, It's awesome that you are starting out so young!
At twelve years old, I would seriously consider a porta studio of some sort. Maybe even a 4 track cassette which you can get for a couple hundred bucks.
Or, if you can come up with about $400, check out
the DP-01 new from TASCAM. Or for about $300 a FOSTEX MR-8. There are some very cool and talented people on this board who can give you great advice about using the MR-8.
Either of those machine will allow you to do basic tracking AND transfer tracks over to your computer PC (with USB cable) so you can work with PC based software.
With most of these, you will either need a mixdown deck of some sort or a way to mixdown to your PC.
I know some pc recording proactivists might disagree with me, but I honestly believe you will build very valuable skills by starting out this way.
The ease with which you will be able to lay down tracks and the skills you will learn will serve you very well through out your recording career!
Plus - you will be able to spend more time with your hands on your instruments instead of a mouse!
Good luck and keep us posted!