It's a very easy but fun game. It isn't poker.
4 of a kind > full house > 3 of a kind > two pair > pair > high card
The trick is the bet the house button is present for the first reveal of a card and the second, so if you have a good high pair you can double your money quite easily.
Also you reset to $250 on a complete loss so you can easily spam the bet the house button to get back up to a good amount of cash.
Otherwise you can just bet $1 until you are confident of a winning hand and then switch to $50 bets.