You can use any business card paper (Avery template 8371 or equivalent). Each card should be 2" x 3-1/2" and come 10 to a sheet.

The Reports Settings screen allows you to adjust the page margins for these reports.

So you don't waste the relatively expensive card paper, do a test print on regular paper. Visually compare the printout to the card paper and adjust the page margins as necessary.

Yes. You can use any of the supplied background images or one of your own. The background image can be changed in the respective settings screen.