Never Played. Want to play. How do I start?

They are all quite easy to grasp if I'm being honest .

It's better to focus on what is fun for you, while taking into account there is a meta(most efficient tactic available).

Certain heroes are going to be more valuable to a team than others, so it's important to learn good hero combinations and being able to switch to whatever your team may need.

You can just google, overwatch meta list and find lots of information on it.

Good luck have fun