Answer:
1. Case on Affordable Care Act provisions heard in state court.
The first stage is the hear the case at State level to decide if it goes against state law.
2. Petitions filed at federal level.
Petitions can then be filed at federal level because in matters of the U.S. Constitution, there are federal courts that hold more authority than state courts.
3. Supreme Court decision effects similar laws in all 50 states.
When the Supreme Court makes a decision on the matter, this decision will be binding on all 50 states in the Republic because the Supreme Court is the highest court in the land and the guardian of the Constitution and so they have final say on matters involving it.