My suggestion is stay away! As Mr Logic correctly pointed out card counting is totally useless against an online casino as they use unlimited decks that are randomly drawn (so the equivalent of a continuous shuffle in a real casino). If you want to play online there are various free tutorials around that will teach you how to play optimal strategy which means you should only have around a 1% disadvantage - you will still lose in the longrun but it would take you a long time to waste $9000 if you stick to the low value games and just have fun.

If you want to win at Blackjack in the longrun your only option is to learn a card counting system and play at real casinos - but I have been told it is not nearly as glamorous as you would think - a lot of hard work for relatively low returns and if you do start making a good living more than likely you will be banned from every casino you visit.

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"Computers can do that????" - Homer Simpson