Several questions about UML:
Do I include the main class in my UML diagram?
If I do include it, and it instantiates objects, do I draw an empty arrow (such as ->) from my main class to the classes it instantiates?
When do I use the diamond vs. the arrow?

I'm just curious about those 3 things... While an article would also be very helpful, could someone address those three questions?

Thank you so much.