if anyone could help me i'd be grateful. I want to have a sphere rising then moving across my sky and setting i want to know whats the best way of achieving such a feat ? Also is it easy to make the object a light source for the entire landscape exempting ambient light that comes from all around?

The best way to achieve this would be to first position a positional light at the center of the sphere. After that you can render the sphere with an emissive color.