Now considering that fact, I didn't see that many tutorials neither, I mean I know all the games myself and that is why I didn't need any but never put myself in the shoes of people who would basically go in completely blind as well. Maybe you should consider like a "tutorial" button or maybe "learn how to" type of button, it could be very very tiny somewhere on the page of that game and it would basically show on the website with clicks and buttons on what does exactly what and that would help these people out.

 On the other hand I am not entirely sure if people who are willing to gamble all that much money to casinos have zero idea about gambling, sure there could be some but I doubt there are many of them, probably just a very few.