Work friend complaining about his pc freezing and sends this in our work group. Haha i giggled

Damn it! that feeling...

Hello good people i need someones help... i want to build an online teaching website for practice ... like treehouse or pluralsight but a much more lightweight version.
I dont know how to start ;

Which skeletons to use.
Which cms do i choose if necessay.
Should i use node.
Should i use react.
Where do i host it.
Why do i need each point mentioned.
What else do i need.

I learn a lot my self but i really need direction on this one .. its my first big project.

I intend being a freelancer.

I could also do with mentorship from anyone willing here.....!!!!