I've sold about 400 45s and LPs on eBay. For me, 45s sold the best. Remember, most collectors don't want regular albums sold at the record store. They want hard to find stuff. They want first press stuff. You can find out info about your LPs from the push marks on the vinyl close to the label, if its not available on the label.
Beatles: You won't get much more than 20$ if that for a very good condition Beatles album. The White album with all photos attached and in excellent to near mint will fetch you about 20$.
1st press Beatles 45s will fetch in the thousands and 1st press LPs in the hundreds. If you have a sealed Beatles album, they will fetch a lot more.
Beatles albums from Japan fetch a lot too.
Elvis 1st or 2nd press do well but his albums which sold in the millions not much as they are easy to find.
Most rock albums from the 70s and 80s wont fetch much. But certain genres might, like some punk rock stuff.
Guthrie albums if vintage and not recuts will fetch a good price.
I found hundreds of 45s on the side of the road and it was fun as hell to listen to them on my phonograph. I had an Elvis 45 2nd press Mystery Train which I sold for about 70$ but the fun part was listening to it. It sounded like I was in the recording studio. This is part of the reason they are so sought after. The sound is great. It was fun listening to Little Richard too.