My first grow was using CFLs.
I made a reflector that held 8 bulbs. i used the 3500k 42w cfls. 2 bag seed plants in a 2x4 closet yielded around 100g. 1/2 of it was airy popcorn buds, but they had some nice colas tho. i did let them get to tall by far.
I recommend making a new hps light your first upgrade tho, they make a difference
When growing with CFLs, keep your plants short, or bend them over and keep the lights around 4's above them at most. try to put the bulbs around the plant, not just above it.