Import Numbers spreadsheet and print l;abele

I am looking for a way to do a bulk mailing / mail merge project WITHOUT using any Microsoft products. I know with Microsoft, I can create an Excel spreadsheet with columns for Company name, address and zip codes. Then I can export/import them into a Avery mailing label and print these labels out. I am going to have over 1000 addresses and certainly don’t want to ad all these to my contacts on the Mac side. I have Pages and Numbers, so I am looking for a way to do this without having to use anything by Microsoft. After all, this was my reason for leaving behind the PC world after 25 years. Also, it would be very helpful if there was a way to scan these addresses in and then import them somehow, some way so that I don’t have to manually enter all this information. Somebody, please help me. Thank you in advance.