1. I remember you can always go with a lot of people, but usually you'll play up to 4 players, fit just nice to the buggy car capacity.
2. The best I know is that it doesn't look tiring, but you're actually using your whole body muscle to swing your club and hit the ball. And it does need your stamina and strength a lot since it can be a whole day long game depending on your performance.
3. Usually caddies are the one who either carry the golf set or drive the buggy car, or even both. I guess it depends on the golf courses? I only know up to this point
4. No they're not using just one stick, or more accurately club. They have 3 types in general that has different function for different terrain and they have numbers of them to vary your need.
Wew I actually know something about golf