Running your own casino brand is next to impossible if you don’t have a staff and loads of start-up capital. You will also need to understand the laws in your legal jurisdiction if you are a casino owner.
The smarter way to go is as an affiliate since you won’t be tied down to a single program (as I assume the sites you referenced are) and you don’t have to deal with players directly. Word of warning though, you may have time to burn, but you will need to treat this as a nearly full time business to make any real progress and even then you could be looking at years to see anything of real value for your time invested.