try and standardise your weopons so you need only 2 types of ammo:1 for primary guns(assault rifles or machine guns) and 1 type of ammo for secondary(preferably shotguns or high damage pistols)
at okaida regularly upgrade your armoury so your guys all have standard bulletproof vest and assault rifles save up $50,000 and then do the desert patrol mission
dont go near qubba otherwise the police take all ur cash then u have no more cash to give the remaining police so they end up killing you for no reason
agility and strength are the best things as theres no other way to change ur walking speed or capacity to hold weopons while accuracy and intelligence increase things whichn increase with experience in them anyway
if you get killed by robbers at the start your either getting rid of your good weps your going to close to them or you forget about ammo: in which case its all your fault
once u have enough cash get guys with good amjount of strength and agility buy rifles for them and if u have enough after that buy shotguns for close range combat