You need at least 100W for the first plant and 50w for every plant after that, With CFL's, you've gotta keep 'em close to the plant too. Like 2" away MAX. You want daylight (6500k) cfl's for veg and warm white (2700k) for flower.
Unless you step it up to about 400w and invest in some good nutes, you're not going to get FAT colas. You can still get some decent shit, but even with just the minimum cfl wattage (200w for 3 plants) your not going to get rock hard donkey dick colas. Gotta put into it what you want out of it.
There's tons more that goes into it, but that's a couple of basics. Good luck with your grow man.