No worries, ask as many questions as you wish. 😄
After a consult with my friend who has a deeper understanding of the rules than myself here are your answers:
1. If unit fails movement roll it is done with it’s phase.
2. If unit is disrupted it is done with it’s phase.
3. If the commander goes first and is disrupted the rest cannot banzai/angriff as disrupted commanders lose their SA. So I would send him last.