Check out the games.

[moneypenny]

If you are going to play a game online I would suggest that you spend some time observing first. I have found that some of the games are a little to complicated for my liking.
I also like to watch and see how many people are winning and if it is the same group of people all the time. This way I can put my money into a game that I understand and have a decent chance of winning.
I don't like games that have too many players in them.

[luckylady]

Whether playing bingo online, or in a bingo hall, it makes good sense to play against fewer players, giving yourself better odds of winning!

[lucky7]

I agree, it is always a wise idea to observe a game before you attempt to play it, especially if you are unsure of how the game is played and what your supposed to do.
A few times I have found a new game and just jumped right in to play. Of course you can imagine the turn out (it wasnt good). I have learned that lesson and now I am much better off.