Paladin probably has the simplest and most static rotation. You have a melee phase and a magic phase and alternate between the two.

Drk is actually simpler than you might think. It's basically just constantly cycle your 123 combo, use edge of darkness to keep your buff up (and be sure not to cap on mp), use bloodspiller whenever you are gonna cap on blood, use delirium on cooldown, and use living shadow on cooldown (so make sure you got blood available for it)