Buying a switch for my kid (and myself=])
Anyone have any recommendations... anything I should know to look out for.... or any kick ass games/accessories...
What kinds of games?
Some obvious great games like Breath of the Wild, Mario Odyssey, Mario Kart, etc.
A nice cheap game that I think kids would like too is Mario and Rabbids Kingdom Battle. It's like a simplified tactical RPG game and it is about 100x better than it has any right to be. And it's probably cheap at this point since it's not actually from Nintendo.
Also, buy a pro controller or two. They aren't cheap, but they are cheaper than breaking the joycons. Joycons are fine for slow paced/menu based type games, but any games with real jerk movements will be way better with a pro controller.
Also I agree with everything Big said. Three Houses is great if you like tactical RPG's at all, Valkyria Chronicles 4 is really good (so is the first one, which is also on the switch store) and two other RPG's I'd add are Battle Chasers Nightwar and Dragon Quest XI. Neither are groundbreaking, but they are just solid turn based RPG's. I just love the switch for turn based games because its so easy to just stop playing at any moment and come back an hour or a week later to exactly the same spot. If you get Dragon Quest, make sure to turn the combat to the full turn based mode with control of everyone though, the normal mode is pretty dumb to only control one person.
Hades is probably the best single player game I've played in years. It's a perfect amount of replayability, variation from run to run, progression, a touch of story, fun action, and the ability to play it all damn day or for 30 minutes once a week and be great both ways.