In the course of its yearly orbit around the sun, Earth has to ford a number of meteor streams. When the particles enter our atmosphere, they vaporize due to friction with the air. To watch the shower, all you need is a dark sky, with no moon and no city lights. Simply stretch out on a lawn chair and gaze attentively up at the stars. If the meteors are flying, you'll see them.
Most meteors showers are better after midnight.
But the Geminid meteor stream encounters Earth's orbit at an unusual angle. But then you have to consider the moon. It sets tonight around mid-evening. We're Block and Byrd for Earth and Sky.