Amergin, you might want to make friends with a local printer -- if you think you'll want to do other chapbooks in the future, you definitely want to. The binding that you'll need will depend on how many pages and how heavy the stock is. It's most helpful to know a printer to consult on these things. If there's a chapbook you particularly admire, take it to the print shop(s) and ask "how much to match the quality of this for X number of copies." On the other hand, your graphic artist friend may have a printing service she's accustomed to working with (she'll be familiar with the formats they use, templates they may have on hand, their allowances for "bleed" and other printing arcana). If that's the case, see if they can send you a sample or two of books they've already done.