I want to start PVP but it's impossible

Yes, this is bad, however there is a solution. What you need to do is do korthia stuff, get some korthia gear and fill the missing gear with unupgraded honor gear which now goes to 213 ilevel in pvp at rank 1 (or something like that).
This is already not bad at all to start playing arenas. With this gear you can spam arena and buy conquest gear, and you will win games because at low rating a lot of people are as badly geared as you.

You can also get the earth ele legendary and play as a resto, since there is a big healer deficit you will be able to find some geared warrior that will carry you through your weak state until you get some conquest gear together.

Just by playing you will get at least to 1600 rating for basically zero effort. With this you can upgrade to PvP ilevel 249 (I think). The actual huge issue will be getting the honor for the conquest upgrades themselves, which is a real problem and which is what you will have to save all your honor for.