Great photos so far. No great rarities observed, but I can see why you are overwhelmed with it all. Someone will have fun going through all those covers (letters/envelopes) as much for the history than for the stamps.
On the back shelf of one of your photos it looks like you have a set of Scott's International Postage Stamp Albums, aka "Big Blue". If so, how about a photo of the first page of stamps from Great Britain, France, and Germany. That may help give us a general idea for the depth and completeness of the collection.
The US pages that you pictured are a little bit better than a beginner's collection, with mostly fairly common stamps, the best ones up to maybe $5-$10 each retail. Hard to tell if this was his main US collection, or possibly a "feeder" collection that he bought to fill spaces in his main album. Seeing some random pages from the other albums may help scope out what you have, and where to go next.
If there is enough value, the easiest way to sell it would be at a public stamp auction, and there are a few options in the Northeast we can recommend. However, shipping and commissions can eat up most of the $$ if all the albums are sparsely filled with low value stamps.
An auction house probably won't want any of the supplies (books, catalogs, mounts, stock cards, glassine envelopes, watermark fluid, etc.) but a local stamp club probably would be appreciative of a donation. Search the internet for stamp clubs near you, here is a sample list:
https://www.linns.com/community/loc...ylvania.htmlKeep in mind that most clubs shut down during Covid and some have not returned, so try to email or call them first to make sure the club is still active.