what are the items i'll need endgame...

Honestly it depends on situation, but there are a few legendary's that everyone can abuse.. the Bee shield the Sham legendary class mods and norfleet for 2nd winds

what class mod should i be looking for?

Depends on your playstyle really and situation, find one that fits your build

Get the legendary hunter class mod
Find one with sniper DMg/accuracy boost

I'd have 2 or 3 different elemental snipers and a badass shotty for close combat

The bee shield is good for boosted DMg

Like he said it's ur preference

i don't even use snipers on my zero, I abuse his cunning tree with points up to bore in the sniper tree and run around with a pistol or shotgun depending on my mood really