[Shoe]

When your playing online it is better to use BB/100 (big bets per 100 hands), as you play more hands per hour than in live poker, and there are not any physical tells.

Online, good players can win about 3BB/100, most winning players are probably between 1-2 BB/100

At the low limits like .25/50 on pokerstars, the players are so bad you might be able to win a little more.

Also, how many hands have you played? It takes about 100,000 hands before you can start to determine what your true winrate is.