Ebay is where I got my first starter light, check there or any hydro shop on the web or if you live by a indoor plant store. and for just pracitce your Miracle Grow should be alright get the bloom formula, but if you are going to get serious about the hobby you need to check into some other nutes I use Fox Farm. And for the size it all really depends on your setup when you turn back your plant will stretch and you dont want to out grow you setup. And you got hole poke in the bottom of that coffe can?