As a Warden you will be naturally more tanky than your Shade and Ranger cousins. Your spells are focused on self-healing and tanking large groups of monsters at once.
You will want to focus into either Agility or Strength, Endurance and some Willpower (Just play with resets until you find the best amount of self-healing for you).
Valuable talents to get are "Arcbolt", "Whirl" and "Road Less Traveled", these will give you a large chunk of Willpower at low cost, saving you stat points for more Strength OR Agility and Endurance.
Lifeblood and Mountain's Fortitude are also good pickups if you're having problems with ranged monsters.