lowryders in a greenhouse

Hey guys... I recently built a greenhouse 6 feet tall, 4 feet wide, and 32 inches thick. Thats 10 2/3 sqaure feet of growing space on each shelf. Since I dont have a ton of money and experience I think I will start with a CFL grow. If anyone had a clever way to set up the light system pictures would be appreciated! Also since I am planning on growing lowryders I was wondering how many I can grow one one shelf. Any advice is appreciated as this will be my first ever grow!

I want to say three a shelf but if you are a novice it may help to go with two. Unless you do a S.O.G. You can search the whole site for CFL grow in the little search box on the top right of this page.