Congrats on the find! Hope it was some stoney shit. Heres some pointers I've learned from my mistakes and endevors.
1st, you started a little late in the season for outdoor. Where are you wanting to grow? indoors/outdoors?
2nd, keep those lites on 24/7. Make sure your soil drains easy. New soil=no fertilizer
3rd, figure out if you want to grow indoor or out. Indoors includes big lites, alot of time, a smelly house. outdoor includes 5-8 gallon container, quality dirt, some fertilizer, sun is free!
keep those lites on your seedling for another 2 weeks, then get it outside. be careful on hot sunny days. hot days will wilt a fresh young plant quickly.
With in 2 weeks outside you should see sex of plant, you have a 50-50 chance of getting a female. If the seedling has good genetics, is female, and you have good soil and alot of sun you should have a good grow and good bud by the end of september begining of october!
Good luck on yer grow!