Content has to build.. Its really impossible to just make a giant content site in a week and sit back. Design your site so content complements it as it grows so you dont have tons of “non-sense” pages waiting for it.
Avoid copying material from the casinos themselves, although it is allowed its worthless as it is not unique, obviously avoid copying good content as there are a lot of lawyers out there supporting Dom.
Design it small, but design it so it can grow.