Hi all... My first game advise is:
Keep your bullet for skill (Fists skill) 'cause if you level up your fists, you level up your attack/defense/health stats. You are stronger so you can beat more player.
2) don't upgrade your Moral, upgrade a little bit your stamina (18-22 is enough) and try to upgrade your Energy all the time...dont put point in hidden attack/defense.
3) if your moral is low, spend your money in Power (investment) and when your $ is low, push Sauna for regener your moral, cost will be very very low and maybe free is you are poor
4) no many player are over level 50, so don't go too fast to upgrade higher than lv50-55 'cause your Vendetta mobsters list will be limited at few guys and you will not found a good target choice!
5) having a lot friends is good But be careful, more friend = less hostile.
...more advises? Ask me..