Your Warrior has all the makings of a real powerhouse in Aion. Starting out in chain gear, and progressing to plate after Ascension, you will stacking the sturdiest armor available. When paired with a good healer you are all but unstoppable, and you have the ability to solo most content.
You will want to choose gear for each of your two possible roles: defensive and offensive. While tanking, a one-handed sword and shield, or sword-n-board, are a necessity. Look for manastones and gear that offer bonuses to your Evasion, Block, and Parry stats. If you're not responsible for party members, however, you can equip a greatsword and gear that boosts your Attack, Accuracy, and Crit Rate. While you will pick up an ability or two that utilizes MP, it is definitely not worth your while to gear for that stat.
As a melee character, you will also want to keep a supply of Power Shards on your character, making sure to activate them upon login. The type gets better as you progress in levels and they all provide a nice addition to your dps.