The newly independent Arys

You are a member of the legal team of the newly independent Arys and your advice is sought on the following:
a. How Arys should claim and define its territorial sea;
b. The legal consequences of making such a claim and in particular whether
neighbouring Beberry’s fishing fleet can be excluded from entering Arys’s
territorial sea for any purpose;
c. Whether other states naval vessels and submarines can be excluded from entering
Arys’s territorial sea; and
d. Whether Arys should claim a contiguous zone.