If you are going to create a broad gambling casino where you also host a live games and all the games that are possible with gambling casino then it will surely cost a lot like millions of dollars. Creating the site will already cost you money but the big problem that you are going to face is how to gather some users if you successfully created the site.

Aside from that, you need to assure also the users that their money is secure in your site and your gambling site is fair. If I were you, it will be good if you can decide what do you like to create so you can focus on it because gambling casino is a very broad term that have a lots of game that only the casino owner can easily create.