How do u have phone sex? (need girls advice)?

One of my friends who I like that likes me wanted phone sex and I wanna do it but Idk how to do it. I need a girls advice for this. So how do u have phone sex? Plz explain it to me!!

You act like you're reading a book, or telling a story only you're the main character.
The story is about you and him, having sex, obviously. And you can add any kind of fantasy you want.
You should start out like this "I'm wearing (insert something sexy here) right now, and I'm touching myself because you make me so wet."
Then you could tell him you're getting up to walk over to him, (it's your story, he could be on the bed, the couch, the floor, the shower, the back seat of the car - it's up to you) And then describe your every move.
For example: As I walk towards you, I slide my hands up to my chest and cup my breasts through my bra. I'm playing with my nipples now; do you want me to take off my bra?" You have to ask him questions and make him contribute to the story.
The foreplay is the easiest, because you take off your clothes, you play with yourself, you tell him how wet you are and how you can't wait to have him deep inside you... stuff like that.
Then you will want to describe yourself giving him oral. Tell him you're flicking your tongue against the top of his dick and then you're taking the whole thing into your warm, wet mouth. Make sure you ask him if he likes that, or ask him what else he wants you to do to him.
He'll probably do the same to you, by telling you what he's doing to you.
The whole time you are listening to him, the point is to touch yourself where he says he is touching you. He tells you what he wants to do to you, so you do it to yourself. Same thing goes for him, when you're telling him that you're giving him head, he's going to be touching himself, too.
When it comes to the actual intercourse, there's not much to it. You just say "up and down" and "in and out" alto. And moan alto, and let him know you're touching yourself and tell him how good he feels.
It works very well if you have a vibrator to use, that way you can actually stimulate yourself to the point of orgasm. You can bet your butt he's going to orgasm, so why not have your fun, too?
As long as you give him details and tons of praise, it will go very well.
Good luck and remember - have fun with it! Don't be embarrassed or it won't be any fun for either of you.