Ya, about the Set and Weapon I knew. In fact I already have them all +6 (done the way you said).
And the other tips are surely helpful. Really helpful. But I've got a question, is Arena random or I get to choose who I fight? Because if I get to choose, then I'm really spending my life until the last of my days in there *lol*.

hi, just some extra tips i think you' ll find usefull.
At lvl 20 the dragon gives you the dragon set, it' s the best armor set you get up to lvl 30.
To get a weapon to match with the set you need to complete all your lvl 20 quests, there should be one quest with those gloves as reward.

Also, don' t forget to sell the upgrade stones you find at the auction house (check the prices before you do it) by the time you reach lvl 30 you will be able to afford the upgrades for your lvl 30 set. (upgrade with normal stones up to +3 and than use a pure stone to upgrade to +6 without risks)

I recall you want a pvp build, if so at lvl 30 you must reset your talents to go full PvP and trust me, you will need to upgrade your lvl 30 gear to exp with a PvP build.

One last thing, if you plan to go PvP you will eventually find out about ranked battles (the classic arena where you fight alone or with friends), right next to the arena there are muosa gamblers that trade arena points with random gear or consumable items. If you need money my advice is to find a friend of your same lvl and spam arena to collect points, for 1000 points you can get a lvl 55 armor piece that sells for 1kk or more at the auction house :P