Helicopters ALWAYS roll upside down in the water. Hold on, survive the impact, wait for the roll, find an exit and follow the bubbles. It is a bit disorienting the first time and you may not know which way is up, follow the bubbles.
I would add what I learned in dunker training: hold on and
maintain a reference point, then work your way hand over hand to the exit. It will likely be dark and you will loose your orientation if you don't always hold on to a point of reference. If you loose your orientation you will probably drown.
Whenever I get on any aircraft, helo or fixed wing, I always take a moment to look around and fix in my mind where the possible exits are, and how to open them.
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