Out of the many 'how to' publications on zine-making that I have read, the Independent Publishing Resource Centre's (IPRC's) version is, by far, the best. It covers everything from format and design to distribution and tabling at fairs. Its writing is clear and concise, and it is incredibly useful, even for a seasoned zinester like me.
The IPRC is located in Portland, Oregon, and embodies everything beautiful about independent writing and publishing. For more information on this organization and its services, please visit its website.