Well.. at Level 3 you can join Illegal mafias!
You have to RP with factions to join, or some factions require applications.. you can find where to apply for a certain faction at
viewforum.php?f=32 Just choose something to join and apply and wait for the faction's T0/T1's ( depends on faction's terms/rules ) to accept you.
When you join a faction you will do jobs for the faction for exmaple rob business with them, you will gain respect and get promoted to higher ranks, and then you might make it to Caporegime(T1), Caporegimes(T1's) can do many things, and have a great respect from their members for exmape " /fcar tow, /fcar ua, /invite, /uninvite... etc. " , And you can hold a sniper, Only T1's and T0's can hold snipers ( to avoid noobs abusing snipers ), You can ask a T1 to make you a gun dealer, then you can do gun runs and earn money for yourself.
When you join a faction you will probably learn more and more that's just a small part from the factions.