Query: GIT bare repro

Hi GIT users

I want to use GIT for my team for distributed development.
The team members are working at different sites.

Would appreciate help on following:

1) Could you point me to some document/example for doing so? This should be very common scenario I assume.

2) I understand that every developer will need a BARE public repro and a personal repro.
        - How does one push new branches to a bare public repro?

        - do Public and personal repro need to be on the same machine?

        - Can one "PROTECT" specific branches in public repro like master?
           One may not want the MASTER of public repro to be overwritten?

Regards,
Vikram