Hosting courses on external sites for resale

Hi all,

I am putting together a business proposal for my current employer to look into hosting our courses on external sites such as Udemy, Coursera etc...

Has anyone been through this process before? Can you recommend any other sites you have had good experiences with? How easy was the process of uploading and hosting on external providers sites? What kind of percentages do they take for each sale?

Any tips or things to avoid would be greatly appreciated.

Thanks in advance,

Niall