I would check out https://www.librarything.com/ https://www.librarything.com/ also. They have a decent app for scanning barcodes and retrieve data from multiple

I would check out https://www.librarything.com/ https://www.librarything.com/ also. They have a decent app for scanning barcodes and retrieve data from multiple sources. Their own database which consists of lots of imported marc records from university libraries I believe, library of congress, amazon, etc. Then they have another project librarycat where you can set up your books as a lending library. Cataloging a large number of books is not going to be an easy process unless they are all relatively new popular books. According to librarything my library is 439 books, every few years I delete my catalog and re-import them it takes about a full weekend. Older books don't have barcodes, old paperbacks have the ISBN barcode on the inside cover. Some books don't have ISBN numbers or Library of Congress numbers. So you will still end up doing a fair amount of manual entry and searching.