You need a good soundcard to go with your PC, hopefully you've already got that. For your acoustic stuff, keep experimenting. I would not worry about the bedroom, some of the worlds greatest recordings were done in a home environment. I can't play the drums either so I have used Groove Agent for that. If you learn ALL the details of that software, it really rocks. If you want to use virtual instruments for, say, piano or strings, I think Native Instruments provides a good selection of cool programs and samples. The Komplete 2 bundle gives you lot of value for your money but is expensive ($1200). If you're not into synthesizers you may be better off just buying one or two of those instruments (Kompakt for instance).
There are plenty of free plug-ins which will at least get you started. My favourite free plug-ins are from Kjaerhus Audio. Check out their Free Series at
http://www.kjaerhusaudio.com/classic-series.php. Easy to use as well!
Good luck and best regards.