The latest version of the manual (mostly just a hand-conversion from the LaTeX version to SGML), can be
found here. Start with the SGML and just email me back any updates or comments or whatever you find is missing or incorrect.
I'm hoping to make it as simple as possible, so even my elderly grandmother could follow it step by step without any complications. That also includes finding relevant sections of the manual for any problem she (or anyone else) might run into.
From there, I'd like to make proper pdf versions and mobile versions... see what you can come up with. I'm also available most days on IRC at irc.plkr.org in the channel #plucker.