Bluffing is absolutely necessary to win online or off. Online, at most should be in a pot with 2 others. More than that forget it. Same rules apply as normal. Don't bluff with absolutely nothing, don't bluff a big winner or big loser.

Although its hard, with all the flitting in and out of players, try and keep track of the people you play against (ie notes) and if you watch them carefully they can give themselves away. ie click fast when they have good hands, slower with bad hands.

I play at Ladbrokes which seems to accept Aussies.