New CMS User/Developer - understanding Mosey sample

Hi, I have been an Ektron developer for 10 years. I am now looking at Optimizely, and have downloaded the Foundation code and have the Mosey sample running.

I find myself, naturally, trying to associate all the things I do in Ektron with the Optimizely CMS.

I could use some help with a couple of starters:

1. Where is the Menu defined? In the Mosey sample, it reaches to a search service; I had to sign up for an account to get that to not crash.
2. How do you modify the menu, or create a new one? In Ektron "Menus" is one of the main categories in the CMS left-pane. 
3. Where are the Templates defined? I see they exist in the CMS because when I create a new page I pick one, but I don't seem them (maybe I am missing them) in the Visual Studio codebase. At least not like Ektron in a \Templates folder
4. Are there Widgets, like in Ektron?

I'm sure I have more questions but it would go a long way to get the above answered. 

Thanks

Chris