Well,this is what I would do.
1.Get some large financial advisers,Including hard core Soviets.
2.Go to the former soviet union,and buy cold war era battle ships,Submarines,and Migs(yes its very possible to do that

).
3.At the same time I would have some men light Iraq's oil fields on fire,
4.I would position Battle ships so they can hit D.C.
5.I would also position ships along the west side of the U.S.
6.At dawn I would open fire on the capital.
7.I would Launch The Mig 14's to intercept The U.S. forces,which would be trying to pull out of Iraq to defend home.
8.At the Same time I would have diplomacy with Middle eastern countries,Once the oil fires have been put out I would Embargo The U.S's Oil supply.
9.With the united states crippled,I Would ask for unconditional surrender in order to aid there economic situation.
10.With The united states under my control,I would take A large amount of thermonuclear Weapons,and Bury them in crucial parts of the world(Mecca,Oil fields,South Africa,)
all able to be set off with a remote detonation.
11.Next I would ask my new countries for a "holy crusade" across Europe.
12. with United States Technology I would ask Britons surrender.
13.With these Two large military suppliers I would Sweep through Europe.
14.I would stop and wait 5 years.
15.I would continue to conquer,taking no unnecessary risks.
16.After the worlds land mass is conquered,I would ban all unnecessary weapons
17.I would set up a constitutional Monarchy*
18.I would rule with Benevolence,not fear.
19.I would Increase Funding of the Arts and Technology.
20.I would build wonders,and not be prejudice to any race,so as not to cause a riot.
21.I would be considered a king,that is loved, not feared(I would also make sure people know I have military authority. )
*The buried Nuclear weapons are to threaten the world,If I was assassinated
Sorry,I'm into strategy and I've given this some thought.