halluci:nation

Hello, I've been a goa/psy(mostly goa) fan for a bit, and I would like to learn how to create it. What I would like to create is very organic sounding old school goa. For example, "Desert Storm- by Holymen&IM" and "After 1000 Years- IM" and "Mahadeva- Astral Projection" I have a trial of FL Studio, and I've been using trials of some well known vsti's, but I don't know what is best for goa. If you could give me any info at all that would be great thanks!