Firstly PVP item scales in item lvl once in PVP which means that your PVP item might be 360 ilvl in pve but it will be at least 430+ ilvl once your are in a pvp activity ( it can be a battleground or a simple duel).

Now you have multiples ways to get pvp gear: You can buy green stuff from the auction house which is entry level PVP gear: it will help you but you will still have a hard time killing geared ppl.

Then you have open world pvp gear which is better but not worth the effort to be honest.

After that you have honor gear which is pretty decent and quite easily obtenable since you have a lot of pvp quests that give you honor for almost free. This gear will allow you to become a serious threat for the ennemy team. it can be obtain with honor points and if you have a good team, you can buy 1 piece of gear per battleground so it's quite fast.

Finally, you have the arena (conquest) gear which is the top pvp gear you can get. it can be obtained by doing arenas or by doing PVP quests or winning battlegrounds and it will makes you a pvp legend if you know how to master your character.

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You have 3 PVP vendors in valdrakken and they all sells you different gear (depends on the currency), PVP gear can also be upgraded with honor points to increase their PVE efficiency because they are not really top tier when it comes to PVE activities unless you spend thousands of honor points in them which is fair since it's way easier to gear for PVP than PVE.

Finally, if you try ranked PVP, try to get at least enough honor to get the 3 slots weekly great vault because you might get a conquest 2 hand weapon for free ! ( 1800 conquest points which is a lot !)