1. Never give anyone money until you see what your buying
2. Don't get fucked over and don't be afraid to say you don't want to buy because it looks like shit
3. NEVER buy shake, make sure you see buds
4. Buy a scale and bring it every where you go when you buy, have them put your bag on the scale if they refuse well...the only reason for that would be if they were doing bad business otherwise they put it on and it weighs out and if anything give themselves a good reputation
5. Learn some form of self-defense, there are no rules in the black market and no one gives a shit if the drug dealer you thought was cool with you robbed you
6. Honestly the best people to do business with are older people, because they have things to lose, like family, houses, cars, no fucking around all business it may be their main source of income kids will try to under cut, rob you, possibly even set you up
7. i could go on forever but remember, your life is more important than getting high, and what i mean by that is don't put yourself in a dumb situation where your waiting for a dealer in some public place and looking so obvious going to jail for weed can and probably will turn your life upside down

knowledge is power

The number one rule for any stoner driving at night should be to check all their lights before driving, wouldn't that be sad to get pulled over with a pungent kush blunt burning just because your left tail light was out.