20-30 pvp at this point in time is booming. There are many skilled and geared people who want to pvp. If you cannot afford to link 6s/5s in your gear I would advise you to level up till 80 so you can farm the 6s yourself.
Currently with enchants of  and the rescaled enchant scale, people do 4k+ damage (without using skills).
If you are deadset on trying to come pvp, I would advice you to link dex/str/hp
use the Hp/dex, hp/str duals and the double statted duals.
DO farm dreads in the dread dungeon, you WILL need them. When you appear without dreads you will probably be kicked from raid.
If you can afford the double statted duals look into linking lvl6 hp lapis for better survivability and not being a 1 hit.
With this you will still be VERY squishy. :/
Dex won't save you as it is NORMAL for fighters/warriors to walk around with 450+ dex. (see here: http://www.aeriagames.com/forums/en/viewtopic.php?t=1756203
Hope you are not dissuaded from joining the fun,