with the brain, A Soul will perceives the world.
Fact! Apart from the involuntary (reflex) actions, that medula oblongata can interpret, which other part of the soul can interpret or perceive any impulse? The brain! Its of note that medula oblongata can't be clearly differentiate from the brain. Impulse from the world captured by sense organs are the effect that a soul to perceive the world. A soul here represent the human being. Its not a part of brain or any part of the body or exist alone or separated from the human body but the totality of the human being.
I don't think so. There is a soul in another dimension. The body is part of it. But even without a body, it can exist.
We must understand a simple truth - The body does not have a soul, the soul has a body.
Without body, it can exist as what? In what form? As a human or spirit?
Form is the concept of our material universe, where every body has a form consisting of atoms (born of stars). I think that in other dimensions there are no such forms of matter. It's probably some kind of energy.
"probably" Means that you are not sure but still need more research. I will implore you to do more. But via a right sources.
"Kind of energy", since humans can achieve an act. Its a kind of energy and a soul likewise other lower animals like dogs etc. They are souls.