Can we take a digital camera

Smaller the better. It can be weird though, some days when there is a different security person they wont allow it. It just depends. I go all the time, (Meh dad works there so he gets free tickets to stuff,) so I know a lot about the place.

Yup

Yes you can bring cameras into arena

Of course try to get small camara with nice zoom to capture the full atmosphere

Yes smaller the better

Yes

I think a smaller one should be fine.