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.
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.
KYC will be fine provide he will established the site as safe and secured playform to everyone, maybe later on he can add KYC since it might be needed in his country for legal registrations. For now the casino needs to have traffic andit can happen by providing a good or eye catchy promotion with site that many will be interested with since its new with great customer service.