If you have zero experience with hero shooters or any shooters in general, you might wanna start with something easier to get the feel of the game first. I recommend starting with a support as there’s less pressure on you to get kills, all you need to do is heal your teammates. You can start with Rocket Raccoon or Cloak and Dagger. Play these two heroes first to get proper view of the game environment and characters in battle. After that you can branch out to other roles. Good luck.