Passenger side door should be an easy fix, it sounds like you just need to reattach the cable to the handle. You do this by removing the door panel, then once you're in there there will be a cable with a hook on the end of it. You need to reattach that to the handle (a bit of plastic with a hole in it)
As for the airbag you will have to get someone to remove the fault code using vag com, and hope it stays off until after the mot, as that is an instant failure I believe.
No idea what you can do about the rest
Good luck, Mo