If You are New....
For newbies, I recommend PokerStars and you should "only play" with their "PLAY MONEY" until you can earn, and maintain, at least $2 million in PLAY MONEY. It is totally "free" and if you lose it, they allow you to "re-load" additional play money.
BTW, I understand that you can "cash-in" your PLAY MONEY...last I heard, you could receive $20 in cash for $2 million in play money...not bad, I'd think.
By doing this, you will have established the fact that "you can actually play poker" well enough to begin "risking your real money". And, you will have built up a good level of "confidence" which is a key ingredient in successful poker.
Once you have done this, and only after you have done this successfully, graduate to playing with "real money" at the lowest Tournament buy-in levels.... stay away from the CASH Games (Ring Games) at this point. Become successful at the "low buy-in tournaments (MTT & SnG)" before moving to higher real money tourneys and Cash Games.
GL on the felt, Wally