A few starter questions

I installed the plugin last week. I think it is a well-arranged plugin and very user-friendly!

Still, I have a few questions:
1. I am thinking of purchasing the profile page extension. Is there a demo of this somewhere?
2. I would like to make the first name and last name mandatory when registering. How do I do this?
3. I would like to customize the dashboard page, which is visible to all users. Is this possible?
4. I would like to customize the emails that are automatically sent to users (e.g. after registering). Is that possible?

Thank you in advance!