Yeah well, I've done a couple of them in my blog. Not many, but some :-)

Here is one called "how to start blogging":

and here another one on "how to write a blog post":

Also, if you type "steemit" into the YouTube search field, you may find a lot more of tutorial videos from different users. Unfortunately there is still no centralized training school or something like that, but you've already come to know @steemaniacs (the account who is replying here :-)), so there we try to give some coachings and help new users to understand the platform and improve their doings here :-)

Please let me know if you have any further questions!