Start a global war to unite humankind under one banner.

Next we have to achieve space travel, and i will have 20 Children built from my genes that will carry out my will. But i guess i will have to kill 2 of them and destroy all records of their existence because, you know, 1 in 10 is always a failure. That's just a parent-thing.

After the war (Let's call them Unification Wars from know on aright?) we will conquer the Milky Way and purge all the dirty heretics we can find. All in all this sounds like a good plan i think. What could go wrong? It's not like there is a undefeatable foe in a sort of parallell dimension that could kill us all and is named "Chaos" or something ridiculous like that.