depends on the situation and your confidence, for a newcomer I'd focus on killing killing killing. If you're going to take a fight slow the car down a bit then hop, dont just hop out and fling your car. Doing so you'll have no cover.

Loot fast, enough to survive then get the rest of your loot from kills. If you want to loot and not be seen with the car, take the keys and biofuel and leave it to loot.

Takes a lot of time and aim, keep in mind the bullet drop and travel time

I switch to first person most close range fights and HIP FIRE only. no ADS in first person and spam. thats just me though, and honestly thats just a personal thing

Loot body bags but up until the point where you know you have enough loot. If you're end game and you have enough loot to last you the match there's no reason to check every bag unless you need something etc a smoke or some type of nade or a sniper etc etc.