Turn on Battery Saver mode
Unless you just love killing your battery -- pretty weird fetish, but whatevs -- this is the first thing you should do after downloading logging in. All it takes is clicking the Pokéball on the bottom of the home screen, then clicking on the setting wheel in the top right corner. Check Battery Saver. Done and done.
Start off with Pikachu
As the series started with Pokémon Red and Blue back in the day, you begin your journey having to choose among Bulbasaur, Charmander, and Squirtle as your first Pokémon. Pikachu ain't in there.
But as Polygon details, there's a secret way to start out with the lil electric rodent that doesn't involve waiting for Pokémon Go Yellow: just ignore the other three. If you ignore the trio four times, they'll reappear with Pikachu to make it a quartet. Though to be honest, they make a lot better gym battlers than they do musicians.