What to wear for 8th grade dance?

At the end of the 8th grade year, the school has a huge formal dance appropriately named the 8th grade dance. Its a way of saying bye to Jr. High, and every person in 8th grade is going to be there.

These are the things I need(its a lot):

Dress. It cant be strapless

Hair style. My hair is medium brown, goes down to about the bottom of my boobs. I have side bangs to about my nose.

Accessories.

Nails. How should I get them done?

I want links, pictures, prices, the whole bit.

This is the shoes that I am wearing, no question, so everything has to match them.

Oh my god, they are gorgeous!

http://www1.macys.com/catalog/product/index.ognc?I...

And I need the whole outfit and accessories and everything to be under $300 total.

Thank you so much!

I am so excited.

Also, what color corsage should I ask him to get me to go with the shoes?