Well, first you need to go through each one and check the condition. Just so we are clear, there is no such thing as "mint" unless the album still is in the shrink wrap. The best you can grade an album is VG+ which means the record plays with little or no surface noise, the cover is in great shape, there is no spindle scratches on the label, and if it came with posters (like The White Album) they should be there.
Make a pile of for the stuff people collect, so make a Beatles pile, a Stones pile, ECT.
Take out all the albums that were popular and are as plentiful as the stars in the sky, so Fleetwood Mac Rumors, Hotel California, Men at Work, Thriller, and such. These usually hit the dollar bin no matter what the condition.
If you have mono copies of classic albums from the 60's you may make some cash, it's hard to say since a lot of rare stuff that was big in collector's circles in the early 80's have pretty much been released. So those rare 13th Floor Elevators, Bo Street Runners, Druids of Stonehenge, and Silver Apples albums don't fetch as much anymore.
Put them up on EBay and make sure you put a bunch up to make it worth your while. You may want to do lots to make it easier and just unload them. The longer you sit around thinking how much money you can make is time wasted. Just do the prep work, don't clean the records, take good photos of the front, side and back of the jacket as well as the record itself and if inserts were originally included make sure they are in there. With the amount you have this could take some time.
As for the CD's, if the release was rare or is no longer in print then they maybe worth something. I know that Mobile Fidelity Sound Labs Gold CD's go for some bucks as well DCC Gold CD's mastered by Steve Hoffman. I was able to sell a MFSL Gold Disc of the Beach Boys "Surfin USA" for $100
since it has been out of print for some time. There is also a market for old CD's that were mastered pretty well but now the re-issue was brick walled and folks look for the old CD because it sounded better.
Never underestimate the collector's market but don't expect to retire on what you have. There is a very good chance that out of everything you said you have there is probably 20 to 50 LP's or CD's that may actually be worth something. Good luck.