You shall practice.
Practise, practise and practise some more.
The only way to become a good Poker player is to learn the rules and hands and practise.
It is only once you are confident in your actions that you will begin to use extra tactics like bluffing.
Luckily, most online casinos offer freeplay options for players who want to have a look see before making a deposit. Most of these freeplay options allow players to keep their winnings. Bonus!
The online casinos we recommend you try are: