User permissions

Permalink
I'm pretty new to c5 (one day of playing around only) but I feel like falling in love :)
Anyway, I'm going to build very simple site for the client which could expand with the time.
What I need at the moment is one page website with simple form. Email address, name, question with three answers (radio buttons) and captcha.
Now two questions:
1. How do I make the email field being required?
2. Is there any way (I guess that's done with permissions) to enable my client to access ONLY reports upon login? I simply don't want him to mess around with other stuff (design, site wide settings, etc) unless he needs to.
I'd be more than grateful if anyone could provide some tips on above.