Not sure if im in the exact right place.. but lets see

I have an idea for a web app. its essentially a garage management app/ site with some different features for employees .. So there would be a backend/ information handling/ calendar/ database etc..

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I have been dabbling with web dev/ python/ c and whatever for a while but have not really retained anything and this is the first concrete idea I have come up with to keep my following one path and have an end result. its beyond my skill range though

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The question though.. of those two courses - both of which i own .. which one would be better to offer me the references to work through my idea? and what further resources would you recommend?