I do have a small question, which may seem a bit stupid but we are all here to learn. Anyways my question is: Is the universe expanding using the energy it had from the Big Bang? if so what would happen if the universe stops expanding?
Yes, everything that happens in the universe depends on the energy delivered by the Big Bang. The very substance of the stars and galaxies was formed from it. Never forget the 1st Law of Thermodynamics: mass/energy can neither be created nor destroyed. If the universe stops expanding it will undergo gravitational collapse, slowly at first but ever faster, to become a blue-shifted, contracting universe. The same energy that caused the expansion will be recaptured in the collapse, to turn the universe into a fireball similar to the one from which it was created. This is called the Big Crunch. One version of what follows says it then disappears into a singularity, only to emerge again as a white hole and continue the cycle ad infinitum.
At present, dark energy has thrown a spanner in the works, and we can't be sure the universe will collapse, but if dark energy turns out to be a reality it must have been there all the time in some form, from the very birth of the universe.