Some practical advice - If the comics are from the 1980s and 90s, they're not going to be super valuable. The highly valuable comics are from the 1960s and earlier. For the 1980s, you'd have to sort through all of the books to MAYBE find a hand full that would go for over $20 apiece, and that's only if they're in just about perfect condition. The most valuable books for this time period were those that were independently produced. Mainstream books like X-Factor, New Mutants, Spider-Man, Superman, etc..from the 80s and 90s are extremely common and easy to come by, and therefore, not rare or desirable. EVERYBODY starting in the 1980s was keeping their comics in plastics and in mint condition. Back in the 60s and before, kids treated their comics like crap and would throw them out since they didn't think they would be worth something someday. That's why older comics are rare and more valuable in better condition. Hologram covers and a multitude of issue #1s were devices to artificially create demand, and that demand did not last, so those are all worth zip right about now.
If you want to price the books, pick up a copy of Wizard or use
www.comicspriceguide.com but you should know how the price guide works first. The prices listed for any given issue are the highest prices a retailer would reasonably be expected to ask for the issues in near perfect shape. That's for retailers. Retailers can put a $5 price tag on a comic and wait 10 years for someone to walk in and buy it at that price. If you want it sold NOW, instead of in ten years, you usually have to settle for 50 cents a piece or less for most books from the 80s and 90s. Check eBay to see what people ACTUALLY pay for the books you have. You'll find most of them in "lots" or collections, not for sale individually.
There are two quick and easy basic options for someone like yourself: Check your local phone book for your nearest comic store, give em a call and ask them if they're buying. They'll look through them, tell you if they're interested, and make you an offer. This is quick, easy, and you'll get paid fast. Your other option is to split the books up into lots, usually of one title a piece (All your X-Men, all your Fantastic Four, all your Spider-Man, etc.) take some pictures and list them on ebay. You'll get a little more money but you'll have to do more work.
But really, unless you have many of them, and they've been kept in comic bags for protection, the best use for them would probably be to find some kids in your life who would enjoy them.
Marvel Versus DC was one of the worst crossovers ever, and can be found in the 25 cents bin at comic stores across the nation. Signatures add $0 to the value of most comics.
