I need help figuring out what armor sets and overall build to use in PVP. All my focus so far has just been PVE so i basically have no gear or any sort of setup for PVP. I only plan to use this for Battlegrounds, I will not be doing anything in cyrodiil. Right now i pretty much get 1 shot before i can even enter a fight and it's super annoying yet i see some people taking on 4 other players taking almost no damage, like how? I currently play a mag templar with a destruction staff but will swap to stam and a different weapon if that might help me as well. I just want to feel like i can survive while at the same time dish out at least decent damage to help the team and not blow up and die in a second.
stam is not easier. You'd need to carefully manage stamina that's also crucial for sprint, break free and dodge.
templar could be a healer and only use jesus beam and javelin to help scoring kills.
Armor depends. I make mistakes all the time but nevertheless got a lot better after pushing it to 50k with Aetherial Ascension. A typical magsorc would hit you with 20k pen frag, so your 30k armor becomes 10k => 15% reduction while 50k => 45%, effectively cancelling all its penetration. Remember you can't help your team if you're dead.
Gladiator's Tenacity script from scribing gives 8% mitigation and S&B Shield Wall gives 7 seconds free auto-block for 135 ultimates. Some troll tanks seem to build max ultimate regen and rely on shield wall to stay alive.
As for damage, turn on combat metrics for pvp and check what people are doing. For example one build at melee range relies on stacking different types of DoTs and status effects, sometimes with sets like Unleashed Terror, then a heavy attack with the monster set Maarselok to burst players.