I'm interested in researching & developing small thorium reactors. What classes/subjects should I take?

Wanting a more detailed answer than just "nuclear engineering." :)

So I'm looking for a mid-life career change and the potential of thorium reactors as a small power source--just a few grams could power an electric car--is something that really interests me. I would like to take as many classes as possible online for several reasons, mostly financial and it being difficult for me to move from my current location to a college. Coursera has an interesting overview class on nuclear science & tech which I may take but I'm looking for more in-depth technical courses. I see that MIT has tons of nuclear science & engineering class resources online but I'm not sure where to start and what subjects to take. I would like to focus on just those needed to gain knowledge of the relevant nuclear cycles as well as what engineering might be involved in the development of a neutron source + some means of harvesting the resulting energy in a small form factor reactor--something suitable for powering a car, house, business, factory, or cluster of homes. Thanks!