The punishment depends upon who busts you (state or federal), the amount of steriods you get caught with (b/c you can face possession with intent to sell charges), and your prior criminal record..
Simple possession in New York is a misdemeanor. The same is true for federal court. Your sentence will probably be probation for a first time offender. Thereafter, you'll probably receive an incarcerative sentence.
Possession with intent to sell/distribute is a felony for both New York State and federal courts. In federal court, the maximum period of incarceration is 5 years. In New York state court, 7 years max. Since I don't do federal work, I don't know whether the federal sentencing guidelines will allow a downward departure to enable you to get probation. But as a first-time offender in New York State, you'll still probably get probation or a jail/probation split. If you are a second-felony offender, mandatory state jail in New York.