Would anyone have suggestions for online creative writing courses for kids 8 years old and up?

My son writes really well - hates actual hand writing part but whatever he write its good and humorous. I would like to encourage him and also train him to put all his thoughts in writing.

He has vivid imagination but writing/typing it all on paper or screen does not work out.

Please help me with suggestions on online writing courses for young kids as well as writing tools or technology that can help him bring those thoughts out on paper or computer.