I personally would rescind EVERY executive order signed by all my predecessors right back to 1870.
That would be a good place to start. Then I’d ask both houses of Congress to go through every law on the books and either re-authorize the law or invalidate it. That would keep them busy for a while.
Any alphabet agency not expressly authorized by a continuing law or the Constitution would be disbanded within two years.
That’s where one starts...
What kinda EO’s were there in the late 1800s?