I have a compilation of posts in this blog related to breastfeeding and working and you can see them here. Meanwhile, you can download and print this very useful guide (PDF) from the Department of Labor and Employment's Bureau of Workers with Special Concerns.
I can, let me reiterate, nothing will happen if you don't take the first step. So read, research, know your rights and make the move! You never know - the lactation room/policy may just be a request away.