[Noisia]

I'm currently lvl 64 shadow priest and my rotation is as follows when im grinding solo:

Vampiric Touch - SW: Pain - Vamp Embrace - Mind Blast - Mind Flay until Mind Blast is ready again - SW:death when they are low enough.


For your level i would suggest -

Mind Blast - SW: Pain - Vamp Embrace - Flay until Blast is ready again, repeat.

This is because you gain nothing from casting VE 1st and it pulls aggro to you. Instead open with blast to get the initial damage off, then use SW: Pain because it is instant, then VE because you have time to get VE off before SW:Pain ticks for the first time, meaning the first tick of SW:Pain will then give you back life.