You usually start gambling from friends advice, I mean when they say let's play blackjack, let's play poker, etc. Then you get interested into this stuff, once you learn from them, then you may want to entertain online. Or even opposite happens, you visit some casinos and see different games, have heard a lot of things about poker, then try to play it. Most of the casinos have a page for every kind of game where you'll see detailed explanation of game process and rules. Usually, this is the way how you are introduced into gambling.

If you don't have game tutorials, then add them without a doubt. It's very necessary! Do you want your customers, who are interested in certain games to leave your casino because they can't understand how to play it from your website? I guess, no, so... And free playing isn't available on every product, for example you can't offer free gambling on live casinos.