As suggested earlier start by finding a list of casinos that treat their players well. Then find their affiliate programs and make a list of them. You can then run that list by what Affiliate Guard Dog has to say about their Terms and Conditions for players.
This site is a perfect resource to do this.
If you aren't already a player find casinos players like on this site. Test them, see if you would recommend this to a friend who likes gambling. If you would then see if their Terms are Affiliate Friendly. You can see the Affiliate Guard Dog announcements here:
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I wish you luck with this industry!
Kind Regards,
Nicolas Johnson
Regal Affiliates Manager