It'll take a year or two. What are you recording? Are you using soft synths or recording real audio? The quality of each link of the recording chain matters. The microphones, instruments, studio acoustics, soundcard. There are many well written guides at tweakheadz.com.
A lot of trial and error is included, sure, so be patient. Books by guys like Bob Katz and Roey Izhaki are worth reading, when you get over the most basic beginner problems.
I'm sure you can find many kind of advice by googling.
SONAR PE 8.5.3, Asus P5B, 2,4 Ghz Dual Core, 4 Gb RAM, GF 7300, EMU 1820, Bluetube Pre - Kontakt4, Ozone, Addictive Drums, PSP Mixpack2, Melda Creative Pack, Melodyne Plugin etc.
The benefit of being a middle aged amateur is the low number of years of frustration ahead of you.