Where to buy tickets when season starts?

Hey Australian Texans fan here, towards Christmas time/ new years I’m taking a 4 week trip through the east coast of America and I most certainly plan on heading around to the main cities in Texas and the south. Anyways just wondering what the best website or service to buy tickets for when they release for the season. Also any recommendations on where to try and get a seat. Would love for a game to line up with the schedule to see them for the first time