Congratulations on discovering the game. Seems like most people playing are returning vets, so it’s cool to see a true noob.
One of the things that make CoH special is the breaking of classic MMO trinity of tank, dps, and healer. With so many different AT’s and power sets, there is a lot more team flexibility. There really isn’t such a thing as a “healer”, and at the higher levels healing isn’t even that important. Play what you want, and enjoy the ride.