Queries for 2290 online

1. Am I required to file my 2290 Form electronically?
2. Can I file for multiple companies?
3. Do I have the right document?
4. I already signed up. How do I access my account?
5. I can't login. What should I do?
6. I'm logged into my account. Where do I start?
7. What is the Vehicle Number?
8. Where do I go now that I have my vehicles entered?
9. How do I pay?
10. What is the PIN for the 8453-EX and how do I create it?