The most common and normal use for advertising is
- Signature Campaigning ..
- Art events (Like what most successful gambling site continues to do)
- Give Away (to lure gambling hunters)
- Offers good returns to the incoming players.
But you can do everything upon your choice , but try to find Good manager to Help you out.
I'd probably recommend those if and only if the casino has ample funds to fund the startup their doing. If not, well then that severely limits the choices they could actually do. I'd suggest signature campaigns as you said, or buying slots for advertisements that allow gambling ads and the like, try to find them cheaply. One more idea would be asking gambling review sites and the like to review your casino, and then let them post it in their respectivce sites/forums so that the casino name itself would get more traction. This ofc requires the casino to actually be a good one so that the review result would also paint the casino, in the eyes of the users, as a good casino.
Well clearly those are the best options to be able to advertise a site, especially here in the forum they would be starting with a very good step, for me everything that has to do with marketing is something that will always be paid only in the medium and long term , obviously it is what is always said and what is recommended, but we do not know what OP's case is, we do not know how his budget is, and if he does not have the budget for a launch of this style, which is a lot of money, it has to appeal to other options, such as social networks, offer different contests to attract the community, I think that's where you can start, it's a normal start like any other.