Because of some hard things, less than 10% of online casino players actually can make money in internet poker. You should not be playing online casino poker for real cash except, at the very minimum. You should understand the concepts of Bankroll Management and Calculating Outs & Odds. If you are playing online, or if are you taking into consideration an online casino playing, and you are not aware of these concepts, I would like to say you are either unaware, or you have a Gambling Problem. Like a lot of first time online players.
Beginners watched poker on TV, saw an ad for www.casino.com signed up, and deposited $100. This is a first mistake, playing $10+1 single table sit and goes. You should have at least had a $200 bankroll to play these stakes. Another first mistake is they did not understand the mathematics involved in poker like calculating outs and odds. The second mistake did not know to take advantage of deposit bonuses. Learn the plus and minus before you start playing at all.  Do not be too impatient to play money games.
You should also ask yourself why you want to play online casino poker. For some real money means you should know the basic needs of online poker strategy. This will give some guideline for your online poker game.