after you've germ'd the seeds and planted them in soil, you should keep them warm and moist, light isn't required at this point but it'll do no harm either, as soon as theyve popped thru the soil, the chances are the shell case will still be attached to the stalk with the first set of leaves in it , these leaves are called cotylidons( shit at spelling!!), either let them fall off naturally or gently, and i do mean very fuckin gently!!, take them off, at this point the plant will want light, not too strong and as close as possible, too far away and the plant will stretch for it and its stalk will be skinny and fall over, u weall want a gentle breeze from a fan goin on them quite soon to help strengthen the stalk. humidity is a major requirement, if u dont have a propogator then a large coke bottle cut in half and cover the seedling, dont water the soil direct instead spary the inside of the coke bottle, propgator hood, with pure water. do not try to use nutrients for at least 2 to 3 weeks.