I have been playing for about 9 months, it is my first pc game & second fps after Plants vs Zombies Garden Warfare on XBox360.
It took me a few weeks to like kb+m, a few months to feel comfortable with a few heroes and only recently have I felt like I can start to be decent in comp.
I give this advice all the time but play mystery heroes, each hero in this game is almost like its own mini game and some will suit you more than others. Which ones look appealing may not be the ones you get value from.
Second, adjust your settings now. I waited too long to do this and wasted alot of time.
Check out this guide, it’s awesome, and look for the author on these forums, he is open to help with most anything and very knowledgeable about the game.
Next, this forum is a great place for tips and tricks, just ask people who main a hero. (you will get some “git gud” replies, but there will be diamonds mixed in.)
Welcome, glhf!