Pioneer Sr-9

I would like to turn my bedroom into a recording studio using my computer. Read the details below.?

I am a R&B singer, similar to Omarion, Chris Brown, Mario, Boyz II Men, etc. My bedroom is carpeted. My computer has FL Studio 7 XXL, I am planning to upgrade my RAM to 1 GB. I can get any software needed, because my cousin owns a software store. I also have some old equipment. I don’t know how useful it may be, due to fact that I don’t have any prior knowledge. I have Pioneer Audio Digital Timer DT-560, Sansui Quartz Pll Synthesizer Turner T-700, Sansui Stereo Graphic Equalizer SE-300, Pioneer Reverberation Amplifier SR-9, and a Technic Stereo Integrated DC Amplifier SU-V8X. What else would I need to buy? Besides a mic. Please tell me what type of mic should I buy? Please tell about mixers, acoustics, pianos, etc. I am on a very, very tight budget, maybe $500. What else? Tell me a good estimate.
I don’t know how to play it, but I have an electrical guitar with an amp. I make beats with fruity loops 7 xxl.

i have this set-up, im going to soundproof the walls soon,
next will be the electronic drum kit.
1.i use a roland juno 6 keyboard
2. a yamaha psr292 keyboard
3. gibson explorer guitar
4. jackson performer guitar
5. sure sm57 mice
6. and pro audo headphones also

have fun, it’s a very expensive hobby but well worth the fun

f.y.i. rock musican 30 years