If past actions are any indication of future actions, none.
Rudy in New York is NOT Rudy in DC. In NY guns is one thing - at the national level, with the whole of the country at bear - something else intirely. He will NOT move against guns spontaneously at the very least, and he may well not oppose pro-gun moves.
THIS is a huge net gain compared to hillary KFC clinton...
None, in the first 100 days as POTUS, Rudy will confiscate all firearms and declare abortions mandatory for all females of child bearing age.