One thing to memorize for sure are your healing gambits. All your morale taps and self heals are great, (exaltation of battle/fierce resolve according to your lvl). Those morale taps grant some threat over time and great heals. Also just spam skills like goad and war cry, basically all your aoe taunts and yells. One rotation i use is fierce resolve-I (forgot what the name is) Shield_Spear_sheild-War Cry- then do a bleed. Just continue that with an ocansional goad in there to keep aggro. I myself have a warden too, lvl 38, his name is adanspear and he lives on the riddermark server. hope this helped and have fun wardens are great.
The moment I truly understand my enemy, understand him enough to destroy him, is the very moment I also love him.