#1 Lanolin!!! You will probably only need this for the first couple of weeks, so one little tube will be ok.
#2 Nursing Pads. Please just get Lansinoh brand nursing pads. They work great, and some of the others don't.
#3 Nursing Bras. I have three daily-wear and one for night sleep. If you like to exercise, have one for that too. Why so many? There will be leaks, and you will need a few to rotate through washing.
#4 Burp Rags aplenty. Have those and your nursing pads handy next to...
#5 A VERY comfortable nursing chair. I'm talking you could sit in it all day, sleep in it at night, lean your arms on the arms while holding an infant for long periods of time, and not get sick of it.
#7 Sustenance. You will want water handy all the time. You'll easily down 32 ounces in a sitting if you're nursing, so go for a big bottle. Also, stock your fridge with healthy things that are easy to grab and eat. Naked Juice is great. Baby carrots. Spinach is better than lettuce because you don't have to chop it. String cheese. Whole milk. Cream top yogurt. Protein drinks. Luna bars. Healthy crackers or chips. Hummus. Seriously try to have lots on hand that you can prepare, eat, and clean up with only one hand.
#8 You may want to consider setting up in front of a TV. There will be a lot of nursing, burping, bouncing, rocking to sleep and holding while sleeping. A lot of this does not really involve face time with the baby or conversation. In fact, with my babies, they had about 10 minutes of really good face time right after they ate and burped, and then the rest of the time, I was glad to have a TV to entertain me while they were awake but needing more physical attention than eye contact.
#9 A copy of BabyWise. It is the best book I have found and I use it. I have a 21-month-old that sleeps 11 hours at night and a 2 1/2 month old that goes 8 hours between night feedings and sleeps another 3-4 after that. Seriously, two kids under two sleeping 11 hours at night. See how many people online don't have that and then tell me that BabyWise doesn't work. Of course, it's not the Bible. You have to make personal adaptations. But read it before the baby comes and then dog-ear the important pages for easy reference after.
#10 Clock. Your cell phone will work. You will be keeping constant tabs on how often your baby eats, so have a trusty timepiece always at your side.