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Honestly, all a high level wizard really would need to do is start Planar Binding outsiders with DR/magic (protection vs guns) and greater teleport. Then he can show them live TV of various world leaders and have them teleport in and kill them. Then just use easily available pictures of other important government centers (from the internet of course) to give information for further teleports for cleanup. The wizard could eliminate most of the governments in the world without anyone being able to figure out where the attacks are coming from or who is doing it.
Once chaos has taken over, then he can start building an army. Gathering loyal followers should be easy for for someone who can summon or create important resources when the world has fallen into chaos. Plus, no one would have weapons that could challenge his bound outsiders who DR/magic. He could slowly take over and place simulacrum of himself as governers to handle logistics. It would take a while, but who is going to stop him since he has already eliminated all the governments.