Sorry but that’s really not her playstyle, as it would take a bit of time to explain every detail about it (and I’m not the best Sombra player to do it), I suggest you watch a streamer called Fitzyhere on twitch or watch recent guides on youtube.
Watching the group stages where she sees a lot of play could also help you.
I know it’s sound patronizing but it’s really not my intention, I was in your spot at some point and I took the time to learn.