Alice's Random function returns a 6 digit double. You give it a range of numbers, i.e., minimum to maximum. All of the numbers it returns will be >= to min but < max. i.e., 2.45712, 0.39718, etc. depending upon your max and min values.
For Alice's timer function you need to do several things: create a class-level variable (used to track number of seconds left) and then create a method in your timer object which accepts the variable as a parameter and then decrements it.
If, as you indicated, your teacher has sort of 'turned you loose' to explore Alice with minimal instruction you might want to 'explore' with a friend or as part of a group of your classmates - there's power in numbers