How Can I Create a New Data Type with Icon

I'm working on an Fuzzy Logic asset for my students at MacEwan University. I'd like to be able to add an entry to the project window to create an instance of my data. I'd also like it to have an icon for the new instance (like Mechanim and Animator). Finally, when they click on the instance, I'd like it to open up a customer editor window.

I imagine all this has been dealt with in dozens of places but I can't seem to find out how to put it all together. Any help would be desired.