Here is a soil mix I used for one of my grows with good success.
you will need the following
1 bag of green sand ( http://www.garden.com/garden-articles/what-the-heck-is-greensand/128/ )
1 bag of composted cow manure ( http://www.vegetablegardener.com/item/2427/using-manure-to-fertilize-your-garden/page/all )
Note the link refers to cow manure in general, Composted manure is best in order to save time.
1 bag of peat moss ( http://www.peatmoss.com/pm-veg.php )
mix 1/2 bag gn sand with the composted cow manure and about 1/4 a bag of peat moss.
once mixed well test it by taking a hand full and compressing it. When you open your hand it should slowly fall apart.
You may add your own nutrients as you see fit.
The links are for information and not meant as any type of promo for the sites.