Use 50% potting soil and 50% perlite. I would germinate your seeds in a damp paper towel, put it in a warm damp place though. Wait up to 48 hours and then plant the seed in a small cup, make sure the green end thats popping out face down. Water a tiny bit until the soil is damp. Place your 250W hps light a foot and a half above the plants atleast, prolly 2 feet to be safe. Wait 2 or 3 more days then water a little more. It should sprout and come out really fast. Only water every 2 or 3 days, even when you think it needs more. Only water if the top inch of soil is dry, just nub ur finger in there. Transplant in a few weeks. Put your light on a timer though, 18 hours of light and 6 hours of darkness untill flower.