A few tips:
1. Do each exercise for 20 sec
2. Rest for 10 sec in between.
The first time you try, do 1 round. If you get tired after 5 exercises then have a 30sec rest before the next set of 5.
As you get better you can do up to 4 sets of each exercise and then have a slightly longer rest in between.
For example:
Exercise 1: Skipping 20sec, 10sec
rest
Do this 4 times.
Then 30sec rest
Then exercise 2: walking lunges
20sec, 10sec rest
Do this 4 times
Then 30 sec rest
Continue in this fashion.
Most importantly have fun!