Pregnancy dreams are awful. I dreamt I had a very, very long and traumatic labour and gave birth to... a tarantula. Now, the long and traumatic labour bit I can relate to but dd is certainly not an arachnid! I had many, many more, giving birth and forgetting for a week so the baby starved, losing the baby, selling her to a witch, exchanging her for a cat and on and on...
Clue up on bfing now and have faith that you can do this. Just a couple of things though. You don't produce milk straight away, you produce colostrum which is a thick sort of yellowy substance that you make in small quantities but is extremely good for the baby and highly calorific. It is normal not to make milk at first. Your milk will come in, mine took 5 days but dd managed just fine on colostrum.
Expressing is no sign of anything. If you can't squeeze milk out or pump it out, this means absolutely nothing in terms of how much milk the baby can transfer.
A bfed baby latches on, swallows (you can see and hear it), goes from working its mouth quite quickly to longer, deeper sucks as they settle into a feed. They normally come off completely floppy and 'milk drunk' with milk running down their chins. It's such an amazing sight. A bfed baby wees regularly, poos yellow, mustardy, seedy nappies and is alert when awake.
All the above is a small snapshot of how you know bfing is working. It is no substitute for reading up/talking to sombody who knows. In our area they haad antenatal bfing classes where they asked you to take a doll with you! Does your area offer something similar?
I bfed exclusively for 7 months and am still bfing at 25 months. I had moments of doubt and worry and cracked nipples and a lot more besides but I have love love loved bfing.