For the contributing docs, I'd suggest starting with the Core Concepts doc, then the Best Practices and/or Code Style guides. Luckily it's a pretty brief guide.
This will let you get your feet wet, and give some time for our resident OpenShift/Ansible expert (Jason, on cc) to give you some more specific guidance. I also suggest reading through Jason's previous answer on the list, here: http://lists.openshift.redhat.com/openshift-archives/dev/2016-March/msg00047.html
(though I'm not sure how relevant it is to your goals personally.) I also recommend joining the IRC channel (Freenode #openshift-outreachy) during business hours in US Eastern time.
We're excited to have you here. Welcome!