Its a little late to ask that question now. if I had been President, I wouldn´t have gone in Iraq in the first place but listened to the 100,000s of protestors that were against.
Now that the military is in and hundreds of soldiers got killed, and thousands of civil persons..
its not gonna get any better, so if I didn´t have too many friends in the oil business, I guess I would
save the soldiers who would lose their lives if I continued the war; get them back to Homebase
ask the CIA to work with a democratically elected Iraqi government to create a new Iraq national secret service who will be responsible to chase out the terrorists; ask for cooperation between secret services
try initiate a roundtable between different Iraqi groups with different interests, under independent supervision by diplomacy
direct all the money I would have spent for the ongoing war to rebuild Iraq - means, give it to Iraqi companies who can build up whats destroyed, not to Anmerican or European companies to make a profit by rebuilding - in some cases cooperation will be necessary and international help needed;
keep an eye on the situation in Israel and the extremists quiet
promote a Palestine state
look for new energy from somewhere else as soon as possible, as soon as this is a safe bet, cancel all the contracts with all Arab nations for any oil business - it will hurt them financially but the market there is too insecure anyway
fire Condi and kick Rumsfeld and Cheney out of whatever positions they have
throw Robertson into jail, invite Chavez and hope for cooperation in the future
give the rest of the money I have used to finance the war to NGOs, Red Cross, Medcines Sans Frontieres etc. who shall go to Iraq to help the people there; for their security I would make a deal with any Muslim nation who wants to help me by sending in some safety troops
install a commission that will find out what was wrong with the nuclear weapons lie, who planned it, executed it, if the President was involved in that fake etc.
tell Blair he can call his soldiers back, same for Berlusconi, thank them for their efforts
make a public speech about how sorry I am that the Prez before me has his share in messing the world up
say sorry to the UN organizations and deal more respectfully with intl bodies in the future, pay the money the US owes the UN
let the Iraqis develop & build up their own nation- they have to decide whether they keep the current chaos or want a new, stable state
-for a start.