Don't !
I started with poker with my dad online at pokerstars. Went pretty good.
My dad sucked at it so he gave his account to me with like 20 dollars left. I played some tournements and won like 400 dollars, I was happy but I didn't really saw it as money, just some numbers to play with.
I started to play 100 dollar double or nothing sit and go's. Won some, lost some. My bankroll was now like 350 dollars, I was planning to cash it out but I wanted to play some more one night. the worst poker night ever. Started out fine, but got some suck outs and tilted like hell. Played way to high limits and tourneys. The result was losing my 350 dollars.
Now I'm still depositing money, winning and eventually losing it. It's so addicting, I'm currently broke and not planning to deposit anymore, but yeah, that's what I said to myself all the other times.