The first episode would be the Admiral addressing all the captains of their missions. Later in a two-parter/season finale the fleet gathers to prevent an invasion or something. The series would end around an assault on another faction that plans to bring an end to the federation (the Dominion, or the Borg, or some new one) and the fleet we follow is met with other Admirals and their fleets for an all out battle. Sprinkle a few guest star/special appearance ship/fleet episodes, space station episodes, and a colony we catch up with time to time and you have a galactic Star Trek series (and a financial nightmare).