Start with Hundreds upon Thousands of Freerolls, It cost's you nothing to play them, and if you can beat the bubble in many you can start to save your winnings in order to accumulate a Bankroll.
That is how I and many other players started, and then when you buy-in to a single Table Sit and Go or a bigger multi table Tournament, the money you lose is other players money, not your own.
Remember What you have never had, you cannot lose, and Rome was not built in a day, It takes time, patience and a lot of study to become a successful player.
Good Luck!