Hey! I'm here!
First off, pretty puppy! I also have one going to her first show this weekend, only she is older than yours. She turned 14 months on Monday, so she is entered in 12-18 month puppy bitches. I'm praying she doesn't jump over the judges head. She's a wild child. Someone else is showing her for me, so they can get embarrassed if she bounces around like a gazelle, LOL
I don't know about grooming a coated dog. Your girl is just a puppy, so not a bunch of coat right now. I'd bath her, and blow dry her, make sure her topline isn't all crazy sticking up in all directions (think flat). Honestly there's not much to do on such a young puppy. Don't do her toenails on the day of the show.
You need a 6 ft lead. I use a thin (1/4") leather one. Even a thin round nylon one would do. I'm probably showing Scarlet with her fursaver. Dead ring.
As for behavior, the judge is pretty much expecting silliness from the puppies. The best thing you can do is to make sure your puppy is having FUN. Happy voice, treats. If she keels over in the ring, just put her right side up, and keep on going, don't get upset with her. HAPPY!!