Yup

First off. Grats on growing man. Give us some specs. Soil/lighting/nutes/age/strain.. Second thing i can tell ya quickly is stretched plants dude. Lower that light. Third thing. Each plant needs to be in its own pot. Or your gonna get some problems real quickly
I agree with everything that nugglet said. You took the words right outta my mouth dude, plus rep
UH, Yeah...what they said.
Get some CFL's or something because the light you have now sucks. I find it kinda hard to believe that you are 18 man......
Ditto.
Get rid of that heat lamp. get as bright a compact fluorescent as you can get and stick that baby about an inch or two above the plants. Also, get yourself a small oscillating fan on them as soon as possible. Strengthens the stems.
If you're using store bought potting soil, don't feed them anything for about a month. Then start them out on whatever you are gonna use for ferts, but do it at no more than 1/2 strength, preferably 1/4 so as not to burn them to a crisp.
That about covers the veg phase, lemme know when you wanna flip 'em to flower. In about 6 weeks or more. Read up on the flowering phase of the plant. Read the sticky MMJ Botany by Clarke. That will prepare you for whats to come.