I'm looking to sell some old comics i found in my house but am not too sure how to go about it. i made an eBay account but found that only a few of them are probably worth something. they include a marvel anthology from 1972 (the mighty world of marvel #3), Marvel tales starring spider man from 1981 and the graphic novel adaption of the Burton batman movie. do you guys have any idea of how i could go about finding out how much they are worth?