Complete MIT Entrepreneurship 101 or 102 – Get $1000 Amazon Web Services Credit (edx.org)

I just signed up for the 101 course which covers finding your customer and so far it seems informative and well done. Note you have to pay a $50 verification fee and pass the class (> 50% score) if you want the $1000 credit. If you just want to take the class, it is free.