I start with organic TOP soil. Then add Perlite for drainage, Vermiculite for water retention, and bat guano as a added starter fertilizer. You can also additionally add kelp meal and worm castings for additional nutrient sources and drainage, but these are more expensive and harder to find.
I cannot stress enough, PROPORTIONS ARE VARIABLE. Depending on your soil and the coarseness of your brand of vermiculite/perlite, you will need to ammend the soil more or less with each. Also, take into account the amount of soil you wish to make. Don't make too much, but certainly not too little either.
If you want something ready mixed, I always hear Pro Mix BX potting soil, largely sold by Agway, is a great soil to use. However, the soil mix I use is usually relatively stable in pH for the entire grow, where as the Pro Mix's main component is peat, which over time through it's breakdown will cause the soil pH to slowly lower (become more acidic). This may cause the need to arise for pH adjustment later.
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