What are your expectations? What are your objectives? Live recordings? Podcasts? Songwriting? Pro Audio mixing for hire?
What is your experience? What do you already have?
Giving a decent equipment list can take a lot of time.
Have you read through the stickies about Interface Comparison Chart? Introduction to Multitrack Computer Interface Recording? All the stickies in the Microphones section? and most importantly, Small Room Acoustics?
Read this thread as well,
LINK
My personal studio (I am foremost a songwriter, but play all sorts of instruments) starts with about $1500 in acoustic treatment and includes a W7 PC with Reason and Cubase (for Steven Slate Drums), Tascam US1800, Two Samsung monitors,
M-Audio M3-8 & KRK Rokit 5 for near field reference, Kawai CE220 piano, Alesis DM10 Studio drum kit, guitars, a Michael Kelly bass, Roland Cube30 amplifier, Yamaha B100 bass head run through Peavey 1820 cab and mikes, cables, stands. Powered by LCR2400 line conditioner and maintained via APC 1100W uninterruptible power supply.
Depending on your budget, start with room treatment to kill bass in the corners and at least primary reflections, then get an interface to suit your needs (2 channel to 64+/midi/SPDIF/ADAT/????). Start with a mike that suits your needs, or if you're doing full blown recording, a mike locker that includes a stereo pair (SDC), condenser (LDC), couple dynamics (Cardioid/Omni/Hyper/???) and possible a ribbon for great vocal pickup. DISCLAIMER: I don't have all of those mikes. My locker is 3 mikes strong, but I've done serious recording in serious studios that had great equipment.
Hope something here helps. BTW, read people's signature lines (under their posts) and you'll see a bit of what their kit is like.
Happy Recording
