Car TV shows are all terrible for this and YouTube is the only way. I personally enjoy Legit Street Cars and Speed Academy as 2 channels that seem to do their builds correctly and share a decent amount of knowledge and detail on the process. I watch several other channels more for entertainment value, but many of those I wouldn’t want to share the road with any of their sketchy builds.
It’s kind of on you to know the car you’re driving to prevent the more expensive issues that driving on a flat can cause. Most BMWs have come with runflats and without spares and jacks for decades now. You either ordered the car with regular tires or they were switched at some point. The computer won’t know, it’s just (stupidly) programmed to show the same low pressure warning it does for all vehicles.
Doesn’t matter, so leave it in the garage. Tilt the sunroof open to help moisture escape as the tint cures.
It’s just an upsell. Most people under 40 can’t afford to buy an almost $70k car. If there were implied age limits, then the 3 series wouldn’t exist.