Ok so let me be straightforward here in saying that i have no idea what the lore is of ESO and its related games so automatically im a little lost in the world, however im learning a little bit. However, that is all irrelevant to what i really am wanting to know but i thought i'd preface by saying that and that i have not played anything close to an mmo like this since possibly WoW years and years ago?

So questions are as follow:
1. What Add-ons are going to benefit me most in PvP and some of the PvE content. Stuff im looking for is damage/threat/heal meter/parses, detecting friendly and enemy targets easier, detecting enemy healers easier, etc... I know some of that may not exist for this game and quite frankly makes the game too easy for pvp at that point, but if its out there, might as well use it right?
2. Where can i find a nice leveling guide as far as obtaining quest in certain zones or whatever for my level and how to most efficiently level. (Lets be honest, i just wanna hit cap and PvP then level more toons later).
3. Are there any vendors/merchants that i can go to in any zones/parts of my current zone that sell gear to upgrade throughout my questing. I ask because im rolling a sorc dps and not sure how to gear really and im getting rocked sometimes by mobs higher than me by a level or 2 (which i think i should be able to handle right if i have "skill"?).
And that sums it up. I know, lots of noob questions but so far im enjoying the game, i just wanna catch up since i just started yesterday literally.
TLDR: Help a noob out, read question 1-3 and provide some feedback plz, and thanks.
Thanks,
Epouranios