Find out if there is a
La Leche League group in your area. It's all women supporting one another with breastfeeding. It's hard to know what questions you might have, until you have them! If you're in touch with LLL, you'll have lots of experienced Moms to help you with any question that arises along the way!
At the very beginning, you should have lots of support from your caregivers (nurses if you are delivering in hospital, midwife if you're delivering elsewhere!) So don't stress if you feel unprepared, they'll help you get started!
Also, find out who your local Lactation Consultant is. That is also someone you can call if you are having any sort of trouble.