Whats a good rotation for a DK blood tank

[Rillo]

With my spec I am supposed to keep diseases up and death runes up with Death strike. Its just hard for me to manage my runes without an actual rotation to go by. This is my armory - The World of Warcraft Armory

[Lectux]

The usual rotation is fine.

IT-PS-HS-HS-DS
DS-DS-HS-HS

Or

IT-PS-HS-HS-DS
DS-HS-HS-HS