Thanks to all for the replies! I think I'll have a go at the import preset idea, thanks wolfnowl.
howardm, I'll look into that. Since not all of my Elements massaged files are refused by Lightroom I might view those files in Elements and for those I feel might be helped by Lightroom I could resave set to Maximize Compatibility.
keithr, thanks for the site suggestion. While it provided valuable information it didn't really address my problem. Its emphasis on a file structure and backup strategy is good. I have 2 "drive in a drawer" units, 1.5T each for alternating backup plus Backblaze cloud backup, which was a godsend when an external 1T raid 1 unit failed when both Seagate Barracuda drives failed within minutes of each other!
The site's suggestion that Adobe felt that, since Lightroom is intended for "professional" users little basic information on its use is needed is ill informed. As a professional librarian involved with the migration to and implementation of two statewide (Georgia) integrated catalog/circulation systems I can attest that full documentation is essential to the success of using new software.
Small rant here: Adobe is not alone in leaving users with the need to buy a book if they find that on line help is inadequate. Grrrr! Back in the day a book of sorts came with programs. Surely the software giants could extend a helping hand in the form of a physical object to guide the novice. And we are all novices with new software. End of rant.
Again, please don't take any of this personally. I really appreciate the suggestions.