First ever grow (bagseed)

This is my first grow ever. I've got 3 bagseeds(1 skunk and 2 Unknown). I plan on doing a micro grow for these 3 plants. I have a grow box with 2 100 watt cfl's and 1 80mm fan for outake and a square at the bottom for intake. Need to know the best soil for me that can be bought at walmart or lowes( no hydro stores for miles around). and the best way to grow these and still get about an ounce per plant.:weed:
 
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