I'm with Video for the soil. I've used MG Organic for seeds and clones. Works great. Make sure its the Organic though. It has a giant tomato on the packaging, and its about 5.50 a bag.
I used the garden soil, not the potting mix. The potting mix had a high PH and didn't seem as loose as the garden soil.
There should be enough nutes in it too last you a few weeks.
Also, while you're at home depot. Buy the 5 gallon buckets they sell, drill some holes in the bottom. Get some 1 inch gravel to put in the bottom. Fill the bucket with about 2 inches of stones, and the rest soil. Rinse your stones first! Who knows what's in that dust. With the stones, holes and MG soil, it makes for really sweet drainage. You will never over water. When I harvest my plants, I always find a huge tap root going down into the stones, with a very advanced root system. I've had a 4 foot plant in this setup. I since changed my lighting setup/room configuration and I'm confident I will get more height.
Good luck.