Orbit camera confusion...

So yes. I know there is already a script premade for orbit cameras, but I'm coming dangerously close to a deadline and also have exams coming up in about 5 days, so i need to get this camera working quickly and I don't have enough time to look through all the tutorials to show me how every part of the premade script works.

The script is too confusing and no matter how many settings I tweak, I'm always left with my character flying way offscreen into the distance. The script is here, but I'd like someone to simply explain how the script works and what i'd need to tweak to prevent my character from practically imploding.

As I previously said, I'm going too damn close to two deadlines, so I'd appreciate any support I can get. Once these deadlines have passed, i'll be able to go over every tutorial and i'll be like the Ash Ketchum of Unity...