Marty, I am 5 months into the hobby and slowly acquiring stuff. I am focused just about exclusively on Postwar Lionel O Gauge, because that's what we had as kids in the early 50s. My aim is to buy distressed locos, cars, motors, parts, tracks, switches, etc. at modest cost, get rid of the rust, clean them up, and figure out how to repair them, and make working sets for my grandchildren.
I don't know what you have in your magic box of train stuff. If you would email me off this board with a description of your treasures I would probably see a bunch of things I need and pay whatever price you think would be fair.
Now back to our regularly scheduled program:
I have bought cheaply a lot of "junk" on EBay on purpose, and I'm sure the sellers were happy to get something for the stuff. This junk is teaching me to turn sows ears into silk purses. I do not buy "good stuff" on EBay because I believe they charge too much, and it annoys me when sellers juice up the price with fantasy "handling and postage" charges. I have gone to a number of garage sales and estate sales. Most of the time I lose out to the dealers who get in earlier than advertised. Often, garage sale sellers think the word "Lionel" is written in gold, and you just have to be willing to walk away from a bad price. Sometimes you pay good money for a loco or a whistle tender that looks OK but is dead internally. Occasionally, you find a decent locomotive that has been neglected for over half a century with no guarantee that it runs or will ever run again, but at a decent price. That happened to me last Friday.
On Friday I drove an hour to an "estate sale" in NJ based on online photos of an old Lionel set. On close inspection, most of the stuff was rusty or broken. The tracks and switches were rusty and pitted, but this 2056 steamer looked pretty good.
I paid the seller more than he asked for but not a lot because it hadn't run since Eisenhower was president, and there was no guarantee it was anything more than a paperweight. When I got it home and touched its roller with a red clip and placed a ground, its wheels turned like a champion...a lot of friction but it worked. So when this project gets its turn I will take it apart, clean it, lube and oil it, and maybe replace the side rods and drive rods if they don't shine up well.
So it is possible to engage in this wonderful hobby at modest cost if you are disciplined and patient for the right purchase, and if you take great pleasure, as I do, in taking old broken things and making them work like new. If I can do it (and I have ZERO technical training) anyone can.