I would like to build custom tool connectors. What area of the code base do you suggest I start from/learn to do this in the most efficient way?
I would suggest reading http://warewolf.io/knowledge-base/tools-and-data-connectors/ to get an overview of how to start. Then you can move onto http://warewolf.io/knowledge-base/activities/ for the next steps.
These two articles should give a good theoretical and practical overview of building tool connectors, should show which projects and classes inside the code base that you can follow to see how they are developed.
Hope this helps. Please let us know if you require further assistance.
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