How do I view my bill?

You will got one in your e-mail

You can look at your purchase history as well:

iTunes Store & Mac App Store: Seeing your purchase history and order numbers

i made a mistake and i delete that email, how can i get one?

Can apple send me again by email?

You've also emptied the trash folder on the email account ? You can view your account's purchase history via your computer's iTunes, but you can't get a replacement emailed receipt : See your purchase history in the iTunes Store on a Mac or PC - Apple Support