I'm traveling to Miami tomorrow and some kind soul has recommended I use Uber to get about.

As I've never used Uber before I have a couple of questions.

1. If I use Uber to get from the airport to the hotel where should I go for pickup?

2. What about tips? From what I can gather Uber charges the ride to my cc. Can I add gratuity or should I tip the driver with cash? Should the tip be similar to what I'd give a cab driver?

Thanks for any replies.