Hi there, hope this is helpful, it's obviously just my experience.
I have/ had 2 inverted nipples, one worse than the other. And the good news is I'm still feeding DD, 9 months old!
I was v worried about it pre birth, just could not see how it would work. I bought Medela nipple formers but really late on and hardly used them and tbh for me I don't think they made much difference.
Things I think would help:
Learn how to hand express and syringe/ spoon feed. This may be useful to you in the early days if your baby can't latch. Also get in some syringes for feeding. I even tried expressing colostrum in pregnancy to have ready but it was near impossible so not sure this is worth it- IME even after birth it's a 2 man job, I needed DH to help me collect the tiny drops as they came out!
Read about deep latch techniques - both biological nurturing and the 'flipple' technique helped me get DD latched onto my tricky nipples.
Find out in advance where to access help quickly- I had a few numbers to hand which definitely helped me when things started to go pear shaped in the first few days!
Have access to a pump, bottles etc. my more deeply inverted nipple was extraordinarily painful in the early days while the adhesions were being broken down by her sucking and also much more difficult to get any kind of latch on. Expressing on that side gave me a bit of a break from the pain while maintaining supply- plus giving DD an occasional
bottle of ebm helped me not panic too much when feeds weren't working too well and panic instead about nipple confusion!
It was really, really tough in the early days, not just because of my nipples as we had other issues too with mega-sleepy DD. But we got there and now I don't ever even think about her latch sadly she has also morphed into a non-sleeping nightmare
Anyway if you want to know more, pm me. I was desperate for success stories from people with inverted nipples before DD was born so I'd be happy to chat more.
Good luck!