Resolved this on my own, finally! I’m posting the solution in case anyone else is searching for an answer like I was.
This article was helpful. I simplified it a bit though.
I copied page.php, header.php & footer.php into my child theme. Then renamed to page-blank.php, header-blank.php & footer-blank.php.
In page-blank.php, I changed get_header() to get_header(blank) and get_footer() to get_footer(blank). I deleted the line for get_sidebar() because I’m not using one.
In footer-blank.php & header-blank.php, I carefully deleted code that displayed info I did not need. I used Cntrl-X to delete each piece so I could re-paste if it messed up the page & checked my published page after each change. Usually Cntrl-Z would reverse what I took out if there was an issue. It seems to work great now.