To break a bank you'll have to steal a car, preferably newer and faster, then you can go to an arms shop where you can buy a lot of intervention equipment just like a vest bulletproof, sniper, binoculars, a knife, and even cars that have on your hood or ceiling weapons with which you can make virtual crimes.
For start, you're in New York with a full ammunition, pistols, bombs, grenades, and with these weapons you'll have to rob the banks to make money, dollars. Gta San Andreas Online is the newest game in the category of GTA games from STEAM in which you will have to pass all of the fighting missions as fast as you can.