Get your feet wet first, before you think about mass producing enough for the dispensaries. Your first several grows will be for the learning experience & providing yourself with personal. In the mean time, read all you can get your hands on, especially lighting & yield. But you can supplement your lights with CFLs & make a BIG difference in yield now. Many growers in sm areas use them as their sole light source. Big lumens in a sm package! On indoor grows & grow logs you'll find pics that will help you get the gist of different light set ups.
-- Once you get the hang of it & feel you've gone as far as possible with your current set up, then you can start thinking about upgrading.

It costs to get started, but gets cheaper once you have your supplies & everything in order.