The WordPress codex is an invaluable learning tool, and is available through their website.
Here is a simple function to add to this file to create a new menu; there are more attributes you can use in
the WordPress Codex:
Here's the information from
the Wordpress Codex, the first place you should look for info.
WordPress Codex is a Bible - of - sorts when it comes to documentation.
Not exact matches
If you'd like to find out more about this kind of query,
WordPress has a section on using Custom Select Queries in the
Codex.
You can find out more information about custom stylesheets for
WordPress's WYSIWYG editor on the
Codex.