There are no strict rules by which to abide. This means that you can do whatever you want, as long as your actions are not hurtful in any way to other living beings. A consideration to this is that the earth and the planets are seen as living beings also. We all are part of the same universe, we are a part of her organism. There are different ways to practice the Pagan religion.
Some people join groups called covens, where they perform rituals and have gatherings.
Others, like me, are solitary practitioners, who perform rituals in their own way and space. The choice to be solitary or in a coven depends on your own desire, and also on the availability of a coven being nearby, one that will accept you and where you will feel at home. As I already said, there is a Goddess in Paganism. She is the world, the universe, everything around us. But there also is a God.