Can I get a few newbie tips?

I new to Overwatch and am having a little bit of trouble starting out.

Well I'm no god at the game but I'll give what I know. Early on you should find the right crosshair and especially find the sensitivity that works for you. A lot of youtube videos that teach you how to properly aim will say to not only use your wrist while aiminng, but also use your arm at the same time, which I've found to be much better than just using your wrist. One thing that threw me off early on was movement. Movement in overwatch is almost instant so hitting skill shots will be very hard with small heros like Lucio, Ana, Tracer, Sombra, etc. Take your time with finding the right hero for you, play stuff like 6V6: Mystery Heroes to get better at most heros, play quick play to practice a specific hero, and then play competitive matches once you feel comfortable with your favorite hero. Youtube has some pretty good videos that cover how to get better at overwatch but also has some pretty bad ones. I say keep playing the game and the more you play the more you'll learn. Just keep with it.

Play all the heroes so you have a feel for what role you decide to main, then make small adjustments like crosshairs, sens, etc. and just keep playing. You'll improve over time. :>

Just play around casually. Try new characters every time you play and see how they work.
If you find someone that you like, keep them in mind, and once you've tried everyone come back to practice the ones you like.

STAY
ON
THE
OBJECTIVE
!!!

Also don't be ashamed of playing a low skill hero if you get results with it. It's better to contribute than to try and be the next twitch legend or some crap.