Here are soem things i would keep in mind:

If in school, don't bring it there.
People talk no matter what so watch for cops...they come eventually.
Go to parties...start rolling joints in front of people. Selling joints can makes some money. Don't tell anyone WHO or WHERE you got it from. Doing this will make sure your prices don't go down or make sure people don't think its poor quality. Make it seem like you are given people deals(even if you mostly are) and make sure they can trust you. Don't smoke any if you want to make good money or just smoke some with people to show them ur product. Hope some of these help.

-peace