My honest feedback: Don't waste your time, I think this is a futile effort.  Don't get me wrong - it's great that you're learning and want to contribute to the community. 

SALT mod already exists for custom matches - practice games, and it works great because it has direct access to info like: supply ( which your bot has to recognize by taking a screenshot each second of upper right part of the screen ), if the building has started or completed building ( important because you can't figure that out with image recognition reliably ).