I have 4 boxes of vintage comic books, going back to the 50's. I grouped them by publisher (like Harvey, Archie, Gold Key, TV series), and then went to the Library and got a copy of the Overstreet Comic Book Guide, by Robert M Overstreet. This book is updated every couple of years. You might want to take a couple of evenings or days to check the groupings, then find the number of each comic book and what it's worth today. Out of 455 comic books, mine are worth way over $1600 now. I haven't yet found a buyer for them (they will all offer a lesser price than their actual worth), but am still looking out here in the mid-west. If you can find a bookstore in your area that also deals with out-of-date books, usually they will direct you to any known buyers, both of books and comics, if they're able to do so. Sure hope you have good luck in selling!
Moe
Moe