For full-time pumping, I recommend the Ameda Purely Yours or the Medela Pump In Style (both double electric pumps). I have been using the Ameda for 4 months full time since I went back to work and I have no complaints and I mention the other as that is the other pump that I see recommended time and time again with the Ameda. There may be others out there that will work just fine, but those two seem to be the go-to pumps for working moms and since time is short for research and you want to make sure you are good to go, either one of those should work for you. I know you can get just the pump without extra storage bottle and bag for the Ameda, so if you are looking to save money I recommend that route and just put it in a bag you already own and use the bottles you will use to feed for storage (most regular sized bottles fit on the pump just fine, my Dr. Brown's bottles do no problem).
To prepare, you need enough milk to give your careprovider the first day for your baby's meals and some extra frozen milk, as much as you can, but don't make yourself crazy either. The idea is to pump at least as much as you need for the next day, that keeps your supply where it needs to be and makes it so you don't need a huge freezer stash for day to day. The freezer stash should ideally be for when your baby has a growth spurt or (ack!) milk gets spilled or something. For how much your baby needs, it depends on your baby and a lot of other things, kellymom.com can give you numbers to work from. At 6 months, just before I started solids, my girl took 3-5oz bottles while she was at daycare for just under 9 hours and she took that pretty much from when she started at 4 months after a couple week adjustment period where who knew what she would take and when
, at 8 months she takes 2-5oz bottles and 2-3 "meals" of solids a day. My advice is to make smaller bottles for the first day (maybe 3-4oz) so less is wasted while your caregiver figures things out. They can always combine bottles together if they figure out quickly your baby wants more at once. And let your caregiver know that while they should obviously feed the baby if hungry, the bottle shouldn't be the answer to every cry, that leads to overfeeding sometimes. Also, have a plan for how/where you will wash pump parts. I do it at work and leave my pump at work except on the weekends, but some people wash parts at home. I also don't wash the parts until the end of the day, I just stick them in the fridge in the bag with my milk, saves some time there too.
Other preparations, when you get your new pump make sure you know how to use it and have hopefully used it a few times before you are using it at work. Make sure you work out with your new employer an acceptable place to pump (should be private with a lock, have an outlet, chair and table of some sort, and available when you need it) and that your employer knows you will need 2-3 breaks for ~20 minutes to pump every day. And that you can be somewhat flexible with the exact time, but they need to happen around the same time each day. Since you are currently interviewing, something to bring up if they call you back for a 2nd interview, probably not necessary in a 1st interview, but it does depend how they do their interviews too. And I would plan to pump 3 times a day and hopefully you will only need 2 times, it just depends how well you respond to the pump, but 2-4oz while fulltime BFing your baby is pretty good actually, you'll get more when you are replacing feedings.
I like having mild distractions while pumping, usually web surfing, sometimes reading or listening to music, so I would prepare something you like that would be a mild distraction. I also like to keep track of what I have pumped at each session, how long they were, what time, etc. Some don't like to do that as it actually creates more stress for them, but if it helps relieve stress for you like me, I recommend it! I'm a complete nerd, so I do it in excel, but notes on paper would be fine too I'm sure. If you have time, pick up the book "The Milk Memos" from your library, excellent read of stories and insights of a bunch of working moms who pump breastmilk for their babies. Oh, and I also like having at least one picture of my baby to look at occasionally while pumping. I'm not sure how much it helps, but it can't hurt and makes me smile
And try not to beat yourself up the first time you spill more than a few drops of milk. It sucks and we all do it one time or another
That's all I can think of for now, I'll post more later if I think of more and feel free to PM me or use this thread more for specific questions.