First think you need to know some basic tips about play selection and choosing the right online casino. 
Be sure that you have at least the basic strategy down before playing. Also, there are a number of card counting software programs that can help you with this aspect of playing.
Play only to online casino how is the best, the known sites have an established rapport about them that gives them more credibility than other fly by night sites. Since these online casino are built for the long term, they will be less likely to try to take advantage of you.
Choose casino with good bonus, take advantage of this free money to help maximize your chances of winning.
By keeping these different tips in mind, you will begin to increase your odds that you will win more consistently. Also blackjack is still a game of chance and risk, this does not mean that you can increase the probabilities in your favor.