Instructions
Identify the comic books you're looking for. They'll be easier to find once you know the titles and issue numbers.
Familiarize yourself with a comic book pricing guide, which will help make sure you're not paying too much for your comic, and a grading chart. The grading chart helps you determine what condition a comic book is in, and is useful if you're serious about collecting.
Search for your comic books. Yard sales, comic book stores, eBay and comic book conventions are good places to start.