7) I couldn't print my boarding pass when I checked in online. Can I print it later?

Yes, most airlines will allow you to reprint your boarding passes.

If you're travelling with TUI log in to the Flight Extras website and if you've already checked-in, you'll see a print button. Click this and your boarding passes will appear, ready for reprinting. You'll be able to do this up to six hours before your outward flight, or up to 25 hours before your return flight. You'll need to print each boarding pass clearly on an individual piece of A4 paper. 

If it's later than this and you need a new copy of your boarding passes, you can collect them from the TUI bag drop desk or at the check in desk of your airline when you arrive at the airport. The service is also available for the following airlines: 

Air Europa, Albastar, ASL Airlines France, ASL Airlines Ireland, Evelop Airlines, Germania, Norwegian, Travel Service, Volotea.