There are all kinds of ways to do this.
I recomend you click on people’s signatures and look at their sites.
You can use a “white label” (check for the forum named that here at CAP) and put up your “fake casion” (we call it casino front), you can buy traffic and send it directly to the casino, you can get ready made templates, and you can build a website. Most of us will agree that a well built, well maintained website is the most profitable, and it is the way most of us choose as the primary vehicle.
But all the ways above work.