Icon in UserControl ... Help Required

Question

I make a simple user control which will i add in my different project. But the question is.

1. Can I add any image or Icon to show in toolbox as my control's Image/icon?
2. Is there any path or process, for that my control will automatic load when studio load?

3. If i give my usercontrol to my friends what is the easiest way to "automatic" attach my control to their studio. (like few 3rd party tools are automatically include in studio & their tools has also image/icon).

Please help me.

Thank you in advance!!