Hey, take the tin foil out and paint the walls with a flat white paint, check the box that you bulb came in to see how many watts it is and there should also be a number from 2700k up to about 5000k, this is important as it will tell you what spectrum it is. you want one that is 4000k +. And you may want to take the light back to the shop and ask for a refund if it is a cfl, they are about £10 max in your loacal hardware store. When you are happy with the size of the plant begin flowering it, to do this you will need to get a few more lights, they should now be around 2700k, put them as close to the plant as you can and all around it, leave the lights on for 12 hours and keep the plant in pitch black for the other 12 (the plant will double up in size in the first week of flowering so keep a eye on the lights and keep moving them when they get to close), no light can get to the plant at this time as it will trick it into thinking it is vegging again..erm....on the lights it should say how many lumens it is aswell,(Lm) you want to aim for around 20000 Lm + in total, im aiming for around 50000 for my 4 plants but i would be more than happy to have 100000 but i dont htink i will be able to get that many. The more lights the better. You should try and get a small fan for now as a big one will probably blow the little girl over, then once the stalk gets big and strong get a bigger fan.
Lol ive learnt most of that from this site over the past 5 days!
Read,Read,Read.
Look at other peoples journals, especially ones that are finished and used the same method as you (CFL) as you will be able to see what that person done and learn from there mistakes.
Good luck mate, you should also thank the person that gave it to you, and then slap them for being such a shit parent to the poor thing!!!