Bottles - I found that the Breastflow bottles were the ones that more easily resemble the breast and my LO did not have any issues going back & forth between breast and bottle. How many of these? I started with 8 of the 5oz bottles. Now that sometimes he drinks more than 5.5oz at a time, I have 3 of the 9oz bottles as well.
I would invest in the hands free pumping bra. It willl be great. While at work, I mostly keep it on underneath my sweaters in order to make the pumping session a bit quicker (hey, a few seconds here & there while at work make a difference).
As far as pumps are concerned, everyone is different. I am big chested 34-36DDD, but with very small and semi flat nipples. Having said this, I started pumping with the Ameda Purely Yours and used it throughout the first 12 weeks. During those 12 weeks I had a lot of clogged ducts which I constantly attributed to my LO not drinking correctly. I always had to work my breasts doing compressions and such in order for them to empty. Once I returned to work, I found it was a hassle to carry the pump back and forth due to the weight and having to dismantle the pumping station every morning. My GF was nice enough to allow me to borrow her Medela Pump In Style Advanced to leave at work- wow!!! what a difference the pump made. I was able to empty effortlessly and I have been clog free ever since. So much so is the difference that I went ahead and bought a Medela Pump In Style from Ebay in order to retire my Ameda Purely Yours. Again, everyone is different, but this was my experience.
Bags - I've used the Lansinoh and the First Years as well. Either one is fine. What I do like is the milk storage organizer like this one
http://www.buybuybaby.com/product.as...21510&RN=7067&
I only purchased one of these and when it starts getting a bit full I transfer the bags to a separate zip loc bag and store the milk bags flat in the freezer.
I agree with all the PP's in that you will not want to pump with glasss bottles due to the weight.
For pads, I wasn't a big leaker, but I still wore and wear pads so the bra stays clean after a pumping/nursing session. I bought the medela ones - they are on the larger/thin side. I used a Lansinoh that one of my LC's provided me and I really liked that one. However, I read reviews where reviewers are now indicating that the company has changed them and made them smaller. I am now using the Johnson & Johnson. they are on the smaller but bulkier side. I think I still prefer the Medela ones due to my large chest. I don't need/want any add'l bulkiness added underneath my bra.
What else? at least one nursing bra at hand. Once you deliver, you can go ahead & purchase more. However, I found it a bit difficult to leave the house in the early days after my planned homebirth ended in a c-section. I would have loved to have at least one nursing bra handy. You can purchase it as you get closer to delivery.
I think that's it for now. Any other questions, just shoot them here. There are plenty of helpful mommas here.