You can check specialized comic book valuation websites. Some of them have tools and databases to help you determine the value based on factors like edition, condition, and rarity.
You could also join comic book forums or communities. Members there often share knowledge and experiences about valuing comic books and might be able to offer guidance based on your specific collection.
Another way is to look at online auctions and sales of similar comic books. This can give you an idea of what people are willing to pay for similar items in the current market.