Leveling Classes at level 85

I used the packet spammer in Alchemy to level from Lvl 1 to 85. However I can't level up my Warrior Class now, it's stuck on Rank 1. Whenever I head to /bludrutbrawl to fight brawlers and destroyers, I just get completely decimated since my Default Sword does no dmg. I'm new to the game too, any advice on what to do next would be really appreciated.

kill shadow of nulgath or if u are mem kill nothings (u can search this mobs on aqwiki )