J.S.
Welcome to Mamapedia! Great first question.
I was exactly where you are until I found the phrase "sleep training". A quick google will point you to several websites, or also clicking on the underlined blue words in answers. Or searching within Mamapedia.
We used the series of books "Babywise" and highly recommend them. Ferber has a book out, and there are countless others.
You're going to have to be strong and let her whine a little and not rescue her.
Oh, and by your name I'm assuming your another dad? welcome aboard. :)