Play a game with which you are familiar. This will give you a chance to get used to online poker without feeling you don't belong there.

This may seem like a very obvious rule, but you would be surprised at how many people place bets on games they don’t fully understand. This rule may apply more to certain games (i.e. Roulette) than other games (i.e. Slots), but generally speaking, it is more advantageous for a player to fully understand the rules of a game before betting on it.

In a bet there is a fool and a thief. ~Proverb