A math teacher thinking of real estate

[Ryan Dixon]

Hello everyone, 

I'm Ryan. I'm originally from Arizona but moved to California two years ago to teach high school math in Stockton. I'm 27, and my wife is 24. We are hoping to retire as landlords with cash flow that will sustain a comfortable retirement. At least that's the plan for now.

For the next two years, I will continue to teach math (not my dream job) while my wife is in nursing school. After that I hope to break into real estate somehow ( I've yet to decide exactly what I'll do—I'm in the early stages of education/exploration). We remain unsure as to whether we will want to move back to Arizona or stay in California, so I figure that over the next two years, I will try to get a real estate license in both states. 

Right now, I'm looking for a solid real estate course I can take in California. So here's my first BP question, intended for the Californians in the community:

What real estate course would you recommend?

I should note that I would prefer an online course if possible (I think that's approved in California?) because I teach school until the evening, will be traveling throughout the summer, and will be supporting my wife through a pretty rigorous nursing program in the fall. Your thoughts?