Sorry for the vagueness. When I play DK I just belt things melee style and use the magic abilities to knock stuff down then run around it, whaling on it for all the mouse is worth.
I have tried the Nightblade stealthy tactic and don't seem to be able to get it off the ground as I die too quickly. The Templar is similar as it doesn't have the crowd control early on and can't kill stuff fast enough.
So I guess I am looking for some pointers on how those classes approach the early game.