Do I have to print my boarding pass before I get to the airport, or can I do it when I get there?

Best to print it ahead of time or you can go to a self help kiosk. Some low fare carriers will charge you a printing fee for a paper copy. YOU airline may also an electronic boarding pass from their website or app.

Yes

Yes, to save you time. You can also print it at the airport.

You can get it when you arrive at the airport.