That's right, better to launch the casino first so people could test it out and give several feedbacks regarding the casino later rather than just speculating here. As for the initial games, IMHO roulette would be more attractive instead of keno, you have an option to build it as a multiplayer game as well.
Also if you aiming for profits even just for a little then you have to consider the market demands and add another kind of game not only multiplayer games or merely your desired games because the one who gonna play in the casino is the others not you or the teams. But if you build it just for fun or something like that then you could do anything as you wish with your own casino.
Thank you for your advice.
Launching the site quickly is the first thing we need to do.
And I'll have to ask the public for additional advice and feedback after that.
may I ask if you have a casino/gambling license?
cheers