address labels

Avery in the U.S. provides blank mailing label templates in Pages document format. You could download it, save it as a template, and then create one label and duplicate accordingly, or painstakingly create unique labels for as many as you need. Life is too short. Pages does not provide built-in Mail/Data merge so you could automate the label-making process.

Your options are to take advantage of Mail Merge features between MS Word and MS Excel, or between the free LibreOffice Writer and LibreOffice Calc spreadsheet.

Or, if you have a CSV sheet of addresses, you can import that into a custom Contact Group. select all entries in the group, and then select the Print panel. On the latter, you choose the Page as Mailing Labels, and then select your specific Avery product number. This will print a sheet of labels.

See Contacts User Guide.

Yes, as mentioned above.

The stock iWork Pages label templates for Business Cards can also match some of the commonly-available sheets of labels from some label vendors. And as mentioned above, there are other templates. Here's one source of iWork Pages templates, and there are others: https://iworkcommunity.com/download/label/

You'll need to figure out how to print those labels on your particular printer.

Usually by loading the labels into a single-sheet manual feed or straight-through path on your printer.

To set up a printer for labels: label a couple of corners of the front and back of a plain blank piece of paper (maybe FTR front top left, FTL, BTR, BTL back top left, etc), then load that now-mostly-blank sheet of paper into the input feed, and print a page of labels from Pages. Look at which side of the paper got the labels printed, and which way the page of labels was oriented on the paper as compared with how the "blank" page was fed into the paper path, and then mark the page orientation on the printer for when you switch to labels. I have some labels added to the inside the door of the straight-through feed-path, showing the needed printing orientation for the usual print jobs.

If your printer allows printing envelopes or postcards or sheets of business cards or other stock as some do, you can also use existing Pages templates to print directly on the envelope stock or the card stock. Various of the Brother MFC printers allow printing directly on envelopes and cards and such, for instance. As do printers from some other vendors. No labels needed. This is what I usually prefer...

Or as mentioned, use a mail-merge app, from a Contacts group, or from some other tool intended for label printing.