Yeah mate tidy the fook up
That flourescent will be good at first, the plants will grow, but when they start getting larger and vegetative growth really kicks in they're going to lag. Flowering (the prize) won't be worth a damn with one flourescent tube. From your circumstances, it sounds like you should go CFL imo, invest in some big wattage CFL's (check eBay), they're not expensive (I pay around £20 for a 125w(625w equiv) bulb, and run multiple ones).
So in short, that light will do you the first few weeks, but if you're looking to make some cash on the side you need yield to make it worthwhile. For that, you need to spend more on bulbs and lighting, part of the process alas.
Also tidy up, its important for plant health and perhaps more seriously - fire hazard when you're not home. Stay safe.