Hello David, and welcome to Just Answer.
I've researched this for you and it will be difficult to get true prices of the comics you have, online. I suggest that you either buy the most recent copy of Overstreet Comic Book Price Guide
at any major bookstore like Barnes and Noble or order on Amazon, as this is known as the most accurate and respected guide for comic prices; or you can download a digital version (there's a charge), if you like, here:http://www.comicbooksecrets.com/theblog/instant-comic-book-values-and-price-guide/
At the website above, you can also find information on how to sell your comics.
You can also go to comic book shows and see what the same comics you own, are selling for. A true collector may be interested in buying the autographed ones, but keep in mind that in this case, supply and demand reign, and if there were many of the same issues produced, they won't be worth much more than the original issue price.
I too, have a comic collection dating back to the 70's and what I thought was worth so much, turns out wasn't worth that much at all, so that's why I would like to let you know from a firsthand view, how this can sometimes turn out being not as lucrative as you thought.
You can get an idea of the varied asking prices of these comic sets on The Death of Superman and Reign of the Supermen from eBay, here:http://www.ebay.com/sch/i.html?_nkw=Death+of+Superman
I realize that this may not be the type of answer you were hoping to get, but as I mentioned, it is very difficult to find actual values or prices people would pay for the particular comics and sets you have, online. I have provided you with resources to find prices to give you an idea of what they're worth and what you might get if you sold them.
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