Don't waste your time taking courses. You'll learn good things in those courses you listed and you should take them, but they won't help you get a product out the door - you can get started way earlier.
Just define your MVP and at each point along the way ask yourself "what do I need to learn to complete feature X?" and then dig that information out online and implement!
Just define your MVP and at each point along the way ask yourself "what do I need to learn to complete feature X?" and then dig that information out online and implement!