PaperRapt said it perfectly! I would only add to make sure you know what size eyelet you are using. The most common is the 1/8", but there are also 1/16" usually for bradlets (but there are some tiny eyelets out there) and then there are larger ones -- 3/16". You can buy a "kit" that includes a hammer, a setter, and a hole-punch (which usually has all three sizes).
If you need to see pictures - I know I do - you can go to the following site:
http://www.impressrubberstamps.com/i...t_eyelets.html
Good luck and HAVE FUN!!!