Oh no shit, you are doing a test run? AWESOME I am SO GLAD to see that.
Go to whatever nursery or farmers supply you have around there and look for a potting mix that does not contain added fertilizer or 'water crystals'. Then if you want to, add a little more perlite to it.
Your pots should have big drain holes and not be very big compared to the plant. You should re-pot often, only going up slightly in size. This prevents soil problems as described in some stickies and FAQs around here. There's a soil chem one in my sig, then a continuous canopy one in basic, and a re-pot one in the FAQs. Read up; they are useful.