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A too short summary: Spend 5/5/5 in the talent trees then fill out mostly in frost. Always use a two-handed weapon. Spam pestilence safely far away from sheeps. Keep your diseases up on your main target at all times. Strangulate casters to pull them when you have a second caster in a group that needs to be pulled or use regular LOS tricks. Mark targets for kill order so DPS in your party knows what targets to beat upon.
A. Why Frost? He can tank in whatever tree he wants.
B. Why Strangulate to pull? You can just death grip. Strangulate is a powerful silence, and best saved for when you want it. You CAN use it, but I would personally save it when possible.
C. Try to keep diseases up on all targets, not just the main. This is especially important if you are frost or unholy. And every tank is gonna want imp Icy touch for the mitigation it offers. 6% slower attack speed on a large group of enemies is pretty awesome.
D. Other than that, some solid advice. Don't DW until Blizz tries to buff it, or you get really good gear/skill on farmed content. It'll take more of these two aspects, because you will take more damage, produce less TpS, and have a much harder time dealing with burst threat from DpSers.