It has already been said but
Discogs.com is all you need.
They have already done all the hard work.
All you need to do is figure out which exact version you have from their vast database and add it to " your collection".
Then when you have done you have all your albums in one place WITH all values based on sales of said album via discogs.
I catalogue my entire collection of vinyl, cassette, reels and CDs which numbers thousands and it really did not take long.
You can add your own notes to each item in your collection say for special like autographed or similar.
Go take a look at discogs, you will not regret it.
But selling them at fair market value?
That is another trick entirely.
