There is running for office and then there is governing, two distinct tasks requiring two very different skill sets. So now President-elect Trump has to put together a Cabinet, a team of advisors, a White House staff, and the rest of the Executive Branch.
Trump has promised that he would surround himself with the best and the smartest people who will help him get things done. So now it remains to be seen who these folks will be.
A big problem is that virtually all of the Republican foreign affairs experts have repudiated Trump during the presidential campaign. Would Trump hire some of them anyway? Would they deign to serve in his administration? True, one might say, these are mostly neo-cons who have kept getting us into wars and other harmful entanglements, so a fresh foreign policy would be better off without them. But who would have the knowledge base to take their place?