What sort of games you like? RPG? Action? First Person Shooters?.....
As you never had a Nintendo console before..... you may be surprised of how much variety you may find with the Switch. Breath of The Wild, as some people already said here, is a must-own. Simply brilliant.
I´d recommend you to get Mario Kart 8 Deluxe and Splatoon, if you´re really into online gaming. Super fun games. You mentioned Pokken... but I do think you should try the demo first. I personally had lots of fun with the original Pokken on WiiU and I believe the Switch version is even better with more modes and characters, but I haven´t played it yet and I do think that it´s a different kind of fighting game that some people many not appreciate.
Other good picks: Fire Emblem Warriors, Snipperclips, Fast RMX, Lego City Undercover, Mario & Rabbids Kingdom Battle
