Back Getting back into WarZ.

So recently I have been starting to play WarZ again after a rather long break. Naturally, I have pretty much forgotten how to do anything (like I was any good at fighting before xd). So if anyone has tips about the general condition of things, like what current combos are the most effective and what the main teams are, that would be great. I hope the maybe start playing competitive for once over the next few months, something that I never really did and potentially getting into an actual team.