Yes. A multiple re-entry permit allows you to leave/return as many times as you like for the validity period of the permit (your allowed to stay stamp).
Depends on the office you use but you shouldn’t need most of that. You may need the TM30, a filled out TM47 form a copy of your passport photo page and entry stamp and a print of your visa.
Any chance of uploading a picture (redacting personal information) of this? A non O isn’t issued for business reasons. It can be issued for various reasons but business isn’t one of them.
You’re right about getting it changed if that what it says - I doubt that would happen.
Just the address of your first place of stay would be ok.
You don’t need a return or onward ticket for a Non O visa. A non O is not multiple entry. You’d need a re-entry permit if you wish to leave before the 90 days to keep your current stamp date valid.