New in 0.97b, there is a Security Notes section that you should read.
There are several sections, including Introduction, Installation, The Basics, FAQ, Reference, and Advanced Topics. There are seperate pages for the Cacti Plugin, and for the optional web-based editor. There is also a reference page for all the error codes that Weathermap can produce, with an explanation, and another reference for the built-in datasource plugins.
There are also a growing number of articles at network-weathermap.com about specific tricks and techniques for making your own maps, including animation, non-network maps and more!
What I'm trying to say is RTFM, but in a more polite way! :-) I put a fair amount of my own time and effort into writing the program, and then a whole bunch more into writing the manual and other documentation - more than a thousand hours by now. I also spend my spare time supporting Weathermap users [I'm one of the all-time most active users on the Cacti forums], but a lot of questions asked are answered in the manual, or worse still, in the FAQ section. Please take a look.
If you are more visually-minded, like me, then the following might also help: