Understanding of Random Process/Random Variable
Let me explain it in another way. Consider you have 6 different function of time.
You only throw your dice once and regarding the outcome you choose on of six functions and the chose one is one outcome of your random process.

Now expand this concept to all possible functions of time instead of only 6 functions and instead of dice throwing consider another form of random event which could append a probability to all (infinite) possible functions. The set of all these possible functions is your ensemble.