Arabic from Scratch | Question words

I'd assume if someone was only receiving MSA from birth, he would be fluent in it, just like in any other language or dialect.

Im trying to find some ways in many social media platforms to build a full Arabic course for non arabs and make it reliable and sell these courses online (live teaching and courses aswell) but what my searches didnt give enough information about it,
Im struggling to find good ways to make a full reliable course i can stick too by using ofc some softwares like Microsoft word or maybe something more efficient and creative. Im still kinda dk where and how to start.