Cataloging vinyl collection with values


I have several hundred vinyl records and a couple dozen 78's. The vinyl are mono (not all in RIAA) and stereo. Mostly jazz, classical and rock. Many are collectable. Almost all are "one owner" and are well-cared-for, acquired between early 50's to mid 90's.
I will be liquidating my collection so my Heirs won't have to deal with them. There is some interest from wholesale buyers who I have talked to, or I may sell online.

What is the best method to catalog these records? I'd like to be able to present a list or spreadsheet to prospective buyers - hopefully with estimated market values for many.

Whether I sell online or not, I'd like to get an idea of fair asking prices.

Is there a universal format, or online vendor's site where I can enter collection and data? One that can be printed/emailed/linked so I can show or refer to?
mikapen
How much time are you going to put into this endeavor? Checking and pricing every album can be tiresome. Maybe list it here for sale as a collection instead.
If you sell them wholesale, the buyer won't care what you think they're worth. You'll probably be lucky to get more than a buck a piece. 
I will probably do this as I continue to digitize the collection. I started with a spreadsheet but I think I can do better, and provide some more info than I started.
It will be a big data entry project, so I expect it to take months.
I am not looking to get max retail - I'd rather find somebody(s) who will enjoy them.It would be nice if I found a site that updated US prices as they are sold (dream on...) but having an exportable list with data that's important to a prospective owner would be nice. I'm not sure what data is important, so I
I don't expect to make a killing here, and my preference would be for somebody to enjoy them.
I have talked to a couple of wholesalers, but they want a list.
I could go to a swap meet - there are a couple in Denver - but that's not of interest to me. There are always leftovers, which leaves me in the same boat.So, mostly, I just want to make a good catalog that's exportable.
And then, @noromance I can list it here or elsewhere as a collection.

@big_greg I am more interested in disposing of these than getting rich. I have enjoyed them for half a century, and now it's somebody else's turn.

Maybe there is a better way, than taking/showing a list to interested parties?Ideas?
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.