I had an ELCS - my milk came in on day 2/3, and DS did pretty well.
A large V shaped cushion to prop yourself up with and something you can put across the scar area to protect it is a good idea. Just get as comfy as possible however you can, really.
After my DS was born, I got him skin to skin in recovery, squeezed a little bit of colustrum out of my nipple, rubbed it on his lips - he started rooting so I put him on the breast, and he started chomping straight away.
And then I kept him there! The best way to get feeding going is just to keep them on you and let them on the boob whenever they want. Don't wait til they scream - just keep them on your breast, really.
I think offering formula early on would be very likely to cause problems, tbh. I know it works for some women - but there's supply and demand issues, etc.
FWIW, women who have CS's are less likely to establish BF-ing, but if they do, are just as likely to continue as women who have VBs. It's worth remembering that CS's means ALL CS's - EMCS and ELCS. Obvs the babies born via EMCS, and the mothers who have EMCS, may well have problems to start with that make BF-ing difficulty, like a stay in SCBU.
I actually felt like my ELCS gave me an advantage BF-ing. I wasn't knackered after labour, and didn't have sore bits to be sitting on after birth when I was trying to get BF-ing going.