I don't "collect" cds or vinyl, although I have a lot of both (around 2,550 12" vinyl, 550 7" vinyl, and 1,000 cds). My wife says I have too much of both and I should get with the times, get rid of them and listen to stuff online. However, my vinyl is mostly from the 60s to mid-80s and I have no intention of getting rid of them. Also, like you, I like being able to hold the record/cd and pop it on whenever I want.
A site I love is Discogs.
https://www.discogs.com/
You can catalogue what you have, find values of vinyl/cds/dvds, buy/sell items, etc. The values are based on items that have been sold (on their site I believe). They give a low, median, and high value. But you really need to look at the individual items sold to get a sense of their condition. That will help determine the value of your items and the value of items you want.