[2020] So I’m new to Xbox. Never played a halo game. Where do I start?

So I’m new to Xbox. Never played a halo game before.

Today whilst going through YouTube I watched the halo Infiniti release trailer and saw people’s reactions.

Game looks good and seems to be a game that I can’t play until I player older games in the series so I can understand the story.

I currently own a Xbox one X. Where is best to start? Are all the games on gamepass?