1st of all, you must know what you are talking about. If your information is wrong, your guide is rubbish.
2ndly, make sure your gramma is (almost) perfect as it makes the guide alot easier to understand.
3rd thing is to use colour seperation. This makes it good to look at.
4th thing... Make sure the size difference isn't too much. It makes it annoying to look at. (For example for 1 section using the maximum size and the next using a medium size, all the time)
5th and final thing is to make sure to use pictures. It makes the "what you need to do" part alot easier to take in.
Good luck with your guides. DO NOT LEACH
(Left open for comments/help)