Yeh the sunnier the better. The soil doesnt really matter because you should just dig a giant hole, buy alot of nice rich soil from the store, and fill it up. Also I would reccomend getting some Perlite, Vermiculite, and Peat moss from the store as well. and mixing that all in the hole. They have all of this at walmart, as well as homedepot and lowers. Also if you can get some orangic fertilzers such as animal compost... fish emulsion... WORM CASTINGS, worm castings would be the best thing, just mix some of that in with the soil that you used to fill in the hole and your plants would grow incredible.
I wouldnt just plant it strait in the dirt that is there, you can do this, and it could work, but you dont know whats in the soil. So I wouldnt.
Just dont get caught buddy. Good luck : )