How can i get my book published?

I'm 12 and I wrote a book about a girl who gets hit by a drunk driver by pushing her enemey out of the way.Everyone whos read says its great and i should get it published.Even my english teacher read some of it and she says i have a gift for writing(not trying to be conceited).my 15 year old sister even read it and liked it. so i was wondering how i get it published and how much money i will most likely make(im saving up for a new laptop).thanks for the answers!