I'm always a fan of more info, so I would probably start a thread, but I'll answer you if I can find time in between nursing.
Starting out, breastfeeding was very difficult and basically didn't work at all. My labor was very hard, possibly because of the induction, so I got morphine. It was quite a while before I gave birth, though - maybe 8 hours? I would have to ask my husband, but it was a long time. Raven wasn't too sleepy right away, she stayed alert and at least tried to nurse when they put her on my chest. They also gave me fentayl while I was getting stitched up (also an opiate). And the doctor gave me codeine for a cough I had so that I wouldn't cough in my sleep and rip my stitches out. I didn't realize it was an opiate too, or I probably wouldn't have taken it. I have one flat nipple and one nearly flat nipple, and she didn't manage to latch on at all really for the first few days . . . and I was so exhausted and out-of-it that I didn't realize she wasn't getting anything. She would latch on (poorly), suck a few times, then fall asleep. Jaundice might have had something to do with it too, she was jaundiced and that apparently makes babies sleepy. So she didn't really get anything, not even colostrum, for a couple of days. She lost a pound in the first three days, from 8lb 2oz to 7lb 2oz. The third night she cried nearly all night (because she was hungry) but would fall asleep as soon as she latched on (because she was sleepy). In the morning she was clearly dehydrated, even to my exhaustion-addled brain, and I was very worried about her. We went back to the hospital and got her weight checked (that's how we know she lost a pound), got her bilirubin checked because it had been borderline too high when we left the previous day, and asked about her being dehydrated. I was out trying to sleep in the truck when the nurse gave my mom a bottle to give her, but I came in just as she was starting to eat it. I wasn't really keen on her getting a bottle specifically, since we were having latching troubles, but she clearly needed some sort of sustenance, so I was glad they gave her formula.
We both got readmitted, her for jaundice and me for exhaustion, basically. They brought me a pump and showed me how to use it, so I pumped regularly to bring in my supply while she drank bottles of formula to help get rid of her jaundice. She also got everything I pumped, but that was about 10 ml (1/3 oz) the first day all put together. The only thing I regret about this is that I didn't think of finger-feeding. After my supply was boosted by pumping, she would latch on and nurse (because it was worth it now that there was a reward of milk) but it hurt like hell. Nearly everyone told me that it would get better, not to worry about it, it's normal for it to hurt for the first week or two. I think some discomfort is to be expected, but this was toe-curling painful. When I finally cried at latch-on and then had a bleeding nipple, my mom realized that this wasn't the usual level of discomfort. I don't know if it was because she had nipple confusion from the early bottles, or if it had to do with my flat nipples, or if she just didn't have a good deep latch, but it was pretty awful. The hospital lent me a pump (thank you, hospital), so I pumped exclusively for a day or two and Erik finger-fed her the milk using a syringe with a bit of tubing on the end (no needle, of course). Since then I've pumped for at least one feeding almost every day, and my nipples are almost completely healed now. We also figured out how to latch her on better - for us what works is I latch her on as deep as I can and then continue to push her on for the first few sucks, working the nipple deeper into her mouth. She helps me do this now.
It's worth noting that my experience is not typical - my sister has flat nipples too, and had a bit of a hard time with her first, but got it worked out by day three with no external help. Her second was just born (4 weeks after Raven!) and was a champion nurser from the get-go, brought in my sister's milk in one day! She just started out with a good latch and a strong sucking urge. So don't expect this much trouble, it's not all that likely. But even if you do have a lot of trouble, it's not the end of the world - Raven and I are both pretty good at this now, she hasn't had any formula since she was 2.5 weeks (and she's nearly 6 weeks now, I can barely believe it!), and she's gaining really well. My nipples almost never hurt significantly anymore, although they do still get sore when she is having a difficult poop while nursing - she whips her head around without unlatching first. And one of them did bleed the other day, but it didn't really hurt . . . maybe they're just getting numb, but sometimes it almost feels pleasant too. My point being that even when it's hard, it gets better and it's still doable. And when I pump now I get about 5-7 oz (150-210 ml) per session - after a 2-3 hour break. It's very satisfying. And Raven is completely adorable when she's latched on . . . and all the rest of the time.
Bring an alarm clock to the hospital. That way, if baby doesn't feed every 2-3 hours, you can set the alarm to remind you to feed him. I *tried* to feed her this often, but I was too tired to keep track, and my sleep was so disorganized that it was really hard.
Each nursing session, even at the beginning, should be 10 minutes minimum of good sucking.
Watch a baby nursing so you can see what it looks and sounds like when they swallow - I thought she was getting something because it "felt" like it in my breasts, but she wasn't swallowing, so she wasn't getting anything. If you can't find this IRL, maybe Youtube has videos?
Ask for a LC to come and help - we had all these problems even WITH the help of the breastfeeding nurse, I can't imagine where we'd be without her.
If baby doesn't seem to be getting anything, start pumping earlier rather than later - my supply would have been high enough by day four if I'd started pumping on day two.
If baby does need a supplement for some reason, finger-feed or use an SNS. That way no nipple confusion should happen, or so I hear.
If you need to give some formula, it's not the end of the world (I'm really grateful for it) but do pump to get your supply up, too.
Incidentally, Raven slept peacefully on my lap the whole time I typed this - I guess she wants to be sure that you and Odin are prepared for breastfeeding!