What happens when a new season starts?

Hi guys and girls,

Season 3 has been going on for a while now.
I know that when a new season starts, your level reset to 1.

What else gets a reset when a new season starts? (Do i have to start at INN again, will i lose my fleet)

Nope, just resets the levels and you build the points again and collect the rewards, everything else continues as it was.