IAmA Request: Professional Back-up dancers

Hi, Just wondering if anyone here has ever been or currently is a back-up dancer. I'm asking 'cos it's what I would love to do and got lots of questions! For example:

1. Where did you train and where would you recommend to go for training?

2. Best tricks/styles to posses for commercial dance?

3. Healthy lifestyle? Do you ever drink/smoke?

4. Dream job?

5. And, ultimately, how did you get to where you are now career-wise?

Thanks! :)