Question

How does a dialogue look like, how do you start it off?

Answer 1

Every time a new person speaks, there is a new paragraph.

"Is everyone asleep?" the professor asked.

Under my breath, "No, we are just dehydrated, daydreaming of water flowing down our throats."

Staring down at his students he continues, " Let's get on with this section then."

...But i would like to add another thing.
You are using two point-of-views.

You are using third person and first.

Answer 2

^ She's right(: