Hugs to you! I know how stressful this can be because I was in your shoes a month ago. However, now Claire is eating fine from a bottle, so I can share what we did and maybe it will help you.
1- I don't really think the type of nipple matters much, actually. We tried a couple, but it seemed pretty obvious that she knew how to use the nipple (she'd sometimes eat an ounce or so) but then just start screaming. She just wanted the real deal, no substitutes. So, we just went back to the one that I wanted to use (because we had the most of them) and she eventually like it fine. (The Medela brand)
2- We originally had someone else (usually my husband) try giving her the bottle. This did not work. After my husband trying a bottle a day for several days, (and getting nothing but screaming) I finally said, "this isn't working, I'm going to try to give it to her myself." Then, I tried giving her a bottle for one feeding a day (I found the second feeding of the day was best to try the bottle.) At first, it went no better for me. (be prepared to have your heart broken. Claire would scream, then stop, turn her head right to my breast and start mouthing, I about died.) But I knew that it would be best for her in the end, so I didn't give up.
3- I would try to get her to drink a little from the bottle, coaxing her. Every day, once a day, one feeding would be from the bottle. (If she didn't drink much, I'd put it back in the fridge and try next feeding, or sometimes then in an hour or two when she would be hungry again, just breastfeed her. I tried never to immediately switch from the bottle to the breast so that she wouldn't think she could hold out for the good stuff.) ***We figured that maybe a jump from eating from a bottle and from a different person might be too much to handle, so we hoped that if she could learn to drink from a bottle from me (her favorite person in the world
then later she might be ok learning to drink from someone else.
It took us a whole month of doing this one bottle a day thing, but then finally, two days before I was to return to work (Claire was ~9 weeks old when I went back to lab). She finally took the bottle from my husband (who is staying home with her this month, except for the few days a week I bring her with me to work.) without any complaining!!!! Yay!! It was a beautiful day!!
As far as pumping goes: pump after you feed her, every single time, for 5-10 minutes (double pumping). And start saving that milk. At first you won't get much and you'll have to use it for the practice bottles, but it will get easier to pump more and more. Then, you'll also be able to pump after you give her the practice bottle and get more because it's a 'missed feeding.' And then you can start freezing the bits to combine later for when you go back to work. It's really only the first day back that's an issue because you'll hopefully be able to pump enough the first day back for your second day. (Pump every 2 hours at first, especially if you're having problems getting a lot.) Also, make sure you're well hydrated. After I've gone back to work I've had a few issues with having a busy day and not drinking enough water and then not having as much milk. Now I really try to drink lots!
ok, I've rambled on long enough. Probably other people in breastfeeding forum have shared this stuff too, anyway. I hope it helps! Good luck!
p.s. I've had good luck trying to get both Claire, and another baby who refused a bottle, to eat while they were crying by feeding them while standing up and doing deep knee bends and 'jiggling.' Plus, you'll get really, really strong!