I'm 15...ive gone through alot of ruff things in my life, n now its time for my change. i need advice?

When i was 10 i started sellin. i was but on da block to make some money to help pay rent by my brothers. n things have gotten worse n worse. i recently had one of my close freinds killed by a rival gang...my life needs to change. I have to make money, i needa quit smoking ciggaretes, n I have to keep out the drug game before i am in any more trouble. i already have 2 year probation..with 2 felons. please help just a lil advice...moving aint an option. and quiting could severly dissapoint my brothers. maybe even kicked out