Currently my website (production server) already have a lot of code in it.
And now I want to start using Git for my projects and setup a staging server for my team.
Can anybody give me any advise?

Here is the picture in my mind:


            Production        - Production server which already have codes
                ↑             
             Staging          - New staging server, will install Trac too
             ↗↙ ↖↘          
      Developer1  Developer2  - Local development 

My question is, how should I start? 

Here are some steps in my mind:

 1. do a `git init` in production server (is this safe?) 
 2. `clone` the repo from production to staging server
 3. developers `clone` the repo from the staging to their local machine
 4. `push` files to the staging server after finish changing
 5. when staging is ready, `push` everything to the production

Does this work flow makes sense, or there are some better way to do it?

What if I only want to change one file?

Does origin/master has anything to do with it in this process?? 
Who is the origin? am I going to end up having multiple origins??

Also, when should a developer use `branch` in this case? 


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Git production/staging server workflow