Here are several Tips which we encountered. If you are, these tips might be difficult to understand and please refer to other website or books first.
Handbooks are very useful.
They have not only LaTeX but also vi, emacs, C, and so on. My favorite books are on this page . You can draw your schematic with Xfig and in that schematic you can write any equations or characters with the LaTeX format. LaTeX includes those equations into your figure. Here is how to do that.