Don't fuck up.
No seriously, learn the map and where the hot spots are. If someone shoots you, shoot them back. If they look suspicious (gangster,hitman) kill them. As for money printers, go to a hiddenarea. Spend time exploring everywhere and survey areas before you attack or settle in them. Never waste your cash on big guns and drugs. Make sure you are never seen, you will always fuck up if your friend prances to your hideout followed by 3 others. Convince people of your alliance, then double cross them. Stuff like that works.
As Axule posted, if it advertises pay-for-admin shit, leave and never join back. Also, if you hear an admin whose voice hasn't deepened yet, leave. I've been perma'd from a few servers just because I assassinated the 10 year old admin.