the best way to play sombra is pushing H in the spawn room
jk, some neat tricks I've learned, not sure if any of this works with any updates or patches, haven't played in a while
-Only hack in those 1v1s if they have short cooldowns (tracer for example) or if you're unsure of their cooldowns on major abilities. You don't want that reveal + time spent hacking to be an instance where they are able to start dealing damage before you.
-You can throw her beacon behind their enemy team, go invisible, then warp to it, remaining invisible. dangerous because if they notice it, they will know you're there. But it's a very good away to avoid stray fire from the teams poking at each other. If they don't notice, could very well be an easy healer elimination.