I recently wrote a tutorial on how to write a plugin in WordPress. I found that though the functions were well documented it was hard for me to connect the dots. The tutorial takes walks you through how to write a plugin from scratch by example. It includes an admin menu/css/js and post/page interaction with css/js. It can be viewed here.
The reason I wrote the tutorial was to help others. I'm not sure how else to do that than share the link. If this post is against forum rules please let me know and I apologize.