Redmine

Merry Christmas to all the Redminers,

I'm a newbee, came from zendesk.

I've successfully installed Redmine on a dedicated server. (turnkey linux stack)

I need your suggestions to setup my workflow.

my requirements are

1. how to host the git repositories on the same server (Redmine).
2. do I have to create users twice? (for Redmine and Git)
3. once we commit the changes to git repository in Redmine, how do I get them to the Production/Development site? ( any automated workflows? the reason I'm asking we wanted to see the applied changes in browser).

I'm very new to this area, spent last 4 days on the web to learn how to use Redmine and git. now familiarize with the Redmine web interface.
But, confused at setting up the environment.

Please point me the right direction to get me going.

Thank you

Regards
Sri