I plan on planting all my babies outdoors around June, and I really want to make this grow worth while because I actually got somthing besides bag seed (thanks to a friend at the city

)... and the first question I have of many is should I mix the dirt I'm using with some potting mix such as Schultz Moisture Plus?
This has ferts in it but very little, i think it says 008-012-008 on the bag. and this is the description it gives: This is a rich organic Mix that includes Sphagnum peat moss, perlite, water holding crystals and a time released plant food.
I'm not really sure what I'm looking for exactly, so I need some help on this one, as a lot and lot of reading really hasn't cleared it up for me.
Thanks!
Also, since I plan on growing them indoors for a few weeks, what should I plant them in? I have a lot of Jiffy Mix, that moisture stuff I was talking about, and some regular schultz potting soil around the house, but I can go out and buy stuff if need be