I want to key and print labels for a mail out. Also, need to know where to find a way to key and print addresses on envelopes. Have to big projects to do.
Think you should use Mail merge. There are quite a few video tutorials on YouTube: Printing Labels with LibreOffice, LibreOffice mail merge. See also Creating and Printing Labels and Business Cards in LibreOffice Help. You can actually use mail merge on envelopes. From Writer, go Insert → Evelope. You’ll need to select data source at this point, so I recommend to watch these two videos first.
There is also chapter in Writer Guide about mail merge.