potential herb master

Just finished building my hydroponic system, it's crazy what you can learn on a forum.
This is officially my favorite site. Facebook for stoners.. roll it upppp!

the window won't be enough light. they'll have go outside. what about a couple of CFL's?

Helpppp! I'm an aspiring cultivator, tried reading on the correct ways to ensure high quality buds & less money spent.
(Money is an object to me, so i'm not even going to pretend like I have it like that)

I germinated 10-15 seeds, hand picked the ones I wanted to grow.
So now I have 3 seedlings each in a 6in. metal flowering pot.
I have them sitting on the floor directly away from the window.
Since my current job doesn't pay me enough, I can't afford horticult. bulbs and such.. Natural lights where it's at for me.
The soil i'm using is, "Miracle-Gro Potting Mix". From what I've read it's decent potting soil.
So. The question is, will my babies grow properly with natural light & choice of soil?
....Or will I be putting time & effort towards FAILURE. (we don't want that)

Plants are about 2-3in's in height at the moment.

Hints & Tips NEEDED.
What can I do to make sure they remain healthy & grow with optimum results under the circumstances of income?