You've already made a mistake. MG soil is no good for plants, spesh seedlings.

The blue/white light spectrum is for vegative growth. Cool CFL's or MH HID.

The red/orange spetrum is for flowering. Warm CFL or HPS HID.

Post these questions in the right forum, you'll get a responce.

The plants do not need ANY ferts untill at least 3 weeks in.

If your using CFL's make sure they're as close to the plant as you can get them.

If your using HID then make sure they are as close as you can get them without buring the plant.

Any other light is crap, so dont bother using them.

CFL - Compact Fluo [the curly lights]
MH - Metal Halide
HPS - High Pressure Sodium
HID - High Intensity Discharge [MH and HPS are HID lights

Growing outdoors is an option, but the light cycle's must be rgiht.

Your probably better off growing inside as you can control the climate.

But dont grow in other peoples houses, only your own. And tell NO ONE.