Answer to Question 1
Article III courts are empowered to adjudicate cases and controversies arising under the U.S. Constitution, federal law, and certain cases between citizens of different states or different counties. Article I courts are tribunals created by Congress to handle specialized types of cases, especially those that arise under the regulatory law of federal agencies. The decisions of Article I courts are generally reviewable in Article III courts. Article III judges are nominated by the president and confirmed to office by the U.S. Senate. Article I judges are not; they are appointed for fixed terms. Article I judges enjoy two protections to foster their independence: life-tenure (unless impeached) and a guarantee that their salaries can never be decreased. Article I judges do not have these protections.
Answer to Question 2
probation