Flat white paint is more reflective than foil and mylar is the best. You probably need to keep the lights closer and you need more of them. The main stalk stretched so far because the seed was probably not deep enough in the soil and also it is stretching for light. It's sparse because there is not enough light too so CFL is the best way to go for you. That many pots you probably need at least 150 actual wattage. Range 5000K for growth and 3000K for bloom. You need fertilizers! You could get them locally at a hardware store. I suggest seaweed tea as a catalyst. Get an NPK for veg that is like 10-5-5 and for bloom NPK 5-10-5. It should say on the package. You could make tea too out of blood meal or bone meal. They have that too. You just stick an ounce in a ladie's stocking and brew it in a micro safe pitcher with some hot water - about 34 ounces and you got fert. The bloom may require getting a package like Orchid bloom or rose bloom. It's up to you but be good with the NPK and follow instructions.