Robots are great but if they become self aware then your screwed. then you have to go all terminator style and make your own future, and make an endless cycle.
I favor making a substance that leeches all available minerals from the ground. Spreading at a geometric Rate that will in about a century cover the planet. *it case your wondering I would call it
Tiberium , as a member of
Nod*
Oh then theres building an army of super soldiers and force my will on to the world then once everyone is under my control start making the world better, by putting a ton of resources into finding cures for cancer and aids, then once thats gets going start heading out into space to colonize other planets. Finally set up a council that will be of elected officials from the seven continents. that would rule for a set period of time then step down and new officials would be elected in.
*there is much more to this*