It'll be fine. I was a wreck last year when my little one started kindergarten. We dropped her off at school and (even though I tried hard not to) I cried a lot. Her teacher hugged me and said it would be okay. LOL Talk about embarrassing! Then I went home and counted the minutes until she came home, worrying the whole time. She came home so excited and happy and couldn't wait to go back the next day. It's going to be harder for you then it is for her.
My daughter's class read "The Kissing Hand" the first day and then they cut out tracings of their hands, glued a heart into the palm, and brought it home. So cute. We borrowed the book from the library- GREAT book! So sweet and perfect to calm nerves, as Christine said.
Good luck and remember tomorrow is the hardest. It gets easier after the first couple of days. Like someone else said- soon you'll wonder why you were worried!