No worries! I'm going to break these down a bit so it's easier:
1. Characters would not immediately know whose dream they're in and would likely have to figure out who their Host is from context clues, or seeing the Host themselves. If the Host character is not present in the dream and there aren't enough clues to figure it out, the Visitor can eventually get an idea for the "feel" of a dream which they may be able to identify with the Host. Hopefully that makes sense!
2. Dreams can be structured in basically any way you choose- the Host character can either be physically present with the Visitor character, or the Visitor character can go it alone with the Host's player essentially GMing the dream. The Host character can also be another facet of the dream, coming and going and acting as the dream requires. It doesn't necessarily have to correspond to the physical presence of the Host.
3. As far as actual influence goes, the Host (and, at player discretion, the Visitor) can alter or influence their dreams (such as by killing monsters, escaping the situation, moving somewhere else), but the dream itself will always be influenced by the god. For example, if you have a Fear dream and you're running from a monster and your Visitor kills the monster for you, it doesn't mean that the dream will suddenly get better. If you don't wake up, then there may be a second monster in the shadows, or you'll find that the monster was actually the Host all along... etc etc.
no subject
1. Characters would not immediately know whose dream they're in and would likely have to figure out who their Host is from context clues, or seeing the Host themselves. If the Host character is not present in the dream and there aren't enough clues to figure it out, the Visitor can eventually get an idea for the "feel" of a dream which they may be able to identify with the Host. Hopefully that makes sense!
2. Dreams can be structured in basically any way you choose- the Host character can either be physically present with the Visitor character, or the Visitor character can go it alone with the Host's player essentially GMing the dream. The Host character can also be another facet of the dream, coming and going and acting as the dream requires. It doesn't necessarily have to correspond to the physical presence of the Host.
3. As far as actual influence goes, the Host (and, at player discretion, the Visitor) can alter or influence their dreams (such as by killing monsters, escaping the situation, moving somewhere else), but the dream itself will always be influenced by the god. For example, if you have a Fear dream and you're running from a monster and your Visitor kills the monster for you, it doesn't mean that the dream will suddenly get better. If you don't wake up, then there may be a second monster in the shadows, or you'll find that the monster was actually the Host all along... etc etc.
I hope that helped!