Well Vegg is the first stage (after 3ish days of germinating anyway), then flowering (when light cycle is changed to 12/12), then budd. Theres a bunch of threads on soil choices, mixing your own seems to be the most popular, worm castings/top soil/ peat moss/ vermeculite etc.. As far as the soil you get at a nursery? just depends what it is, but you can grow in just about any packaged soil. but once your seed is germinated your going to want to plant it in the same soil for its life cycle, unless you absolutly have to xplant it.