Where can I sell my comic collection?

Your best bet would be something like ebay or another auction site. That is where collectors go to look for items. If you go to a comic store to try and sell your comics they will not give you much for them because they will have to turn around and make a profit off the books. If a book is priced at $50, they may only give you $10. Your best bet is to sell them through auctions or place an add in papers.