Personally, I always research and read reviews about the casinos on websites like http://www.casinogamespro.com/online-casinos. The reviews are not biased and you can get a cheeky special bonus for yourself. From my experience, websites never recommend scam casinos. Also, most of the casinos provide information about the games that they offer including house edge and the rules on each variation. You should easily notice if there is something shady going on.

And of course, you could always ask for a certain casino in this forum. Usually, a good trusted website has many users playing and willing to refer other players. There are many topics here and certainly very helpful.