Im still a noob but im finishing a cfl grow right now using basically the same stuff you are. I started off using one 26wt cfl for the seedlings. Once they hit their third node you should use at least one per plant. Starting into veg you should have at least 2 per plant and move up to at least three per plant during flower.:thumbsup:
I didnt use any mg nutrients (other than whats in the soil) until after they passed the third node. Start off by using 1/4 to 1/2 of the recomended dose and follow the instructions on the box.
If you are using straight mg soil i would highly recommend using 25% perlite to help the drainage.
This is just what I did but there is alot of reading you should do on here. Just about everything you need to know is on here.
Good luck