I would
read these articles on this website by Petrula Vrontikis some of them are very helpful.
If you can get your work printed at a better quality place then I would do that instead of printing from home.
I can't really answer your display questions unfortunately cause I'm still thinking of how to do that myself, but i do know you should be able to talk about and answer questions about any piece and make sure to let them look at the portfolio don't try and flip through the pages yourself.
Keep good eye contact, sound enthusiastic and shake hands, and know who your employer is and why you want to work for them!