Hey Dou-
Welcome to the forums. There is a parapgraph in the
Micros FAQ that I've have quoted below. This should answer your questions:
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Win-rate: The number everyone is concerned about and the number we can do nothing about. Be happy with anything above 0 BB / 100 hands. The measure used is big bets per 100 hands. This accounts for multi-tabling and limit differences whereas $/hr gives you no real indication of success. Don't fret with something below 0 BB/100 if you have a small sample size. Variance and downswings happen and they can be quite large (200+ BB losses) and extend over a long period of time (10K+ hands). Your winrate will decrease as you move up in limits. Since its asked all the time, a 3 BB/100 winrate at .50/1.00 (online) is often regarded as great. 6 BB/100 is probably unsustainable. Once you reach 2/4 (online), 2 BB/100 is great for the long term and 4 BB/100 may be unsustainable. Also, you will be a loser from the blinds. The blind commitment is too great to overcome by solid play.
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Make sure you check out the whole FAQ and the associated links!