In your 1) you mentioned cargo, so just to clarify, you can fly cargo for somebody, i.e. not in your own airplane. In general, flying and operating your airplan

In your 1) you mentioned cargo, so just to clarify, you can fly cargo for somebody, i.e. not in your own airplane. In general, flying and operating your airplane for any kind of compensation is what the FAA calls 'holding out' and just a commercial rating is not enough for it (more precisely, you need other, nonflying related qualifications for that, like a 135 certificate). On 2), my experience has been that most students get airsick because of anxiety (I guess it is associated with them fixing their gaze inside the airplane) and is usually not an issue once they gain confidence. Before that, flying early is great advice.