Evolutionists, i need you to explain one of your theories to me(the big bang)?

With regards to your question, the wikipedia articles I'm listing in my sources may be of interest to you. A basic mechanism that can start objects spinning which are not spinning innitially is collision. When you throw a ball foward onto the ground, for instance, it will start to rotate. Whenever a force is applied away from the center of an object, it will tend to rotate. The idea of "conservation of angular momentum" can explain how slow rotations can speed up as an object contracts.