1.pick up all the weapons you could pick after landing, two big gun is batter than one gun with pistol.
2. mouse middle would pin out the target you point at, you could pin out enemy location by pin it, so even while you down you still able pin out enemy place to teammate.
3. fill up you weapons ammo in store by 1500$ cash, it worth it.
4. the most useful thing you could using cash are the UAV that cost 4000$ and pin out all enemy location in whole map.
5.follow the teammates, two gun is batter than lone wolf.
6.prepare two weapons and plan your attack, you could camping and snipe or flank enemy in smg depend on how you weapons load-out and plan attack.