Thank you everyone for your answers! Seems like signature campaigns will be my first move.
Before starting any signature campaign, first try to develop a professional ANN thread and try to convince people play at your casino. You can start my giving special offers / bonus to people who join through bitcointalk. Once you see people joining in, then you can start a signature campaign etc.
He can hire someone who can manage it for him professionally. It's becoming a common thing these days that if there's a casino, the manager of the campaign is also likely the one that is managing their own thread. So, it's like a package deal for them as long as they're paying the right amount that's being asked for the professional fee that's being asked.
Also i hope that your new casino site is unique, attractive with things like no kyc, easy registrations and low withdrawal fee, etc so that people don't have any objection to playing at your site.
Yes, he can apply those good factors to his casino and will only going to ask KYC if it's really necessary and if they're suspicious with their customer's account.