Cycling Questions

Question regarding all things cycling:

1. Have decided to get the Kurt kinetic for at home training. What is the best way to calculate distance,wattage,heart rate to my bike and then upload to Strava?

2. If I get a bike computer (to track outdoor rides) can that also be used for indoor rides? 95 percent of training will be done in garage.

3. Do I have to have clip in shoes? Seems like a silly question, I know.