The United States Constitution established which court systems

The United States Constitution established which court systems?
Has Congress used the Constitutional power to create courts? If so, how have they used this power?
Which court system handles disputes with Last Wills and Testaments?
Where can people go if they are not satisfied with the final decision in a state trial?
Are Intermediate courts under federal control? If not, by what authority do the intermediate courts obtain their power?
Where can people go if they are not satisfied with a federal trial court proceeding decision?
What system of government does the United States have that causes it to have two court systems?
Which court system conducts most of the criminal trials?
When might a case move from the state court system to the federal system?
Can a member of the House of Representatives nominate and confirm a federal judge?
Can a USN Admiral onboard her ship decide the outcome of a private boating accident that occurred on the high-seas? Or, is there a specific court the parties must file their claim? What is the name of that court?