I didn't read all responses but, with our first, I received no pay as I didn't know the short term was our maternity leave and didn't opt into it the year before. I tried to pay ahead on cable, phone, electric, gas so there would be a credit balance. I also tried to do the same with a car but, the bank told me, I still needed to pay monthly, even though I mailed the payments in with the months I wanted them to apply to coupons. So, I second calling companies to make sure. Keep in mind you will be very tired so crock pot meals will be your friend! I breastfed my sons and used the Medela Pump in Style for almost 2 years total combined between the 2. It held up really well.
With the breastfeeding, I would suggest going on sites such as mamapedia and cafemom. I found a lot of useful info there. I also would begin to pump and freeze if you plan on still breastfeeding while working. That way, you can have a healthy stash of bottles ready and won't stress out so much once back to work about pumping volume. I never supplemented our 2 with formula and made it for 18 mos but, I pumped 4 x a day until he was one to make that happen. After his 1 birthday, I don't think I pumped at all. He got whole milk during the day and just nursed in the am and pm. My pumping day started like this. I would wake up at 4:45 am, get ready for work, nurse him, and pump immediately after. I got an avg. of 9 oz with those morning pumps, so, if you can fit a morning one in, it's a very productive time to get some milk! Throughout work, I made sure to stick to a 3 hour pump schedule when possible. I know this was more info than you asked for, but, these really helped me breastfeed and save a TON on what formula would cost.