At that level, I'd suggest throwing out a Glitterdust perhaps and then wading into melee or heal as necessary. Nothing too special.
Slashing weapons for zombies; blunt for skeletons.
Pure good / Holy weapons tend to work extremely well here. If you run Delera's quests, you *must* have a pure good or flametouched weapon to damage those ghostly-looking skeletons.
Otherwise, that's about it.
Keep your songs up at all times if you can; try to keep the SP-reduction song up for big fights (for your casters as well as for you); and keep everyone buffed.