You should checkout VideoCreators, that's pretty much what his channel is all about and another cool thing you can actually let your 4 year old watch it, he's a family guy and actually has another channel which is more of a vlog for his family but there's no cussing or anything he keeps it very PG and also offers a lot of great tips.

I have slowly been doing a bit more content on how to rank videos and stuff but at the end of the day he does a much better job and is much more knowledgeable about the ins and outs of Youtube than myself.

That's funny you meniton that, I think I recently heard among people under 18 Youtube creator is the number one career kids want to have.