[Rails] Contributing to Ruby on Rails - Some problems to start

I'm trying to start with Rails contributions. I read the guide (http://guides.rubyonrails.org/contributing_to_ruby_on_rails.html) and I have some issue, if someone knows of this, I need help:
- What version of Ruby do you use when you work in this?
- Is possible debug the Rails branch code? (I mean the local copy of the code)
- If is possible debug the code, Do you make a new brach each time you want to see a bug or issue? (I don't say the moment when you fix the bug o make a test, I mean the moment when you try to reproduce it).
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Agustin Viñao

Web Developer

Ruby - Ruby On Rails - Cucumber

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