Where to start and where to go?

Hi, as a pre dissertation task for uni I have been asked to learn about software defined networking.

I've gotten as far as to download the onos learning tem xender plate VM that teaches the basics of onos and mininet.

I have 3 or so stordis switches physically I can play with and hope to hook up to my system. Does anyone have a good tutorial or documentation with step omegle by step instructions or can point me in the way of operating systems and controller software?

Hopefully this post can help others who look for this in the future to get a foot into the topic too.

-Cheers