What I tell moms who have cracks is to nurse before baby is hungry. If baby is hungry, feed baby with an alternative and then finish at the breast. Also change positions to alter how baby is on the breast.
I would NOT feed a newborn baby with a bottle. That carries a high risk of causing nipple preference. If I had to, I would definitely always offer the breast to finish at the breast and then get rid of the bottle as soon as I could.
For healing the cracks, moist healing, such as gel pads and lanolin, have worked for me. I always get bad scabs when I have a newborn baby, even with a great latch. You can also look up Newman's Cream and see if you can get what you need to make that up there locally. It works very well.
IME nipple pain extending past two weeks is due to a latch problem or thrush. I always tell myself that first 7-10 days I just have to grin and bear it.
LLL is free Are you sure it was a La Leche League leader, as found here on this website?
Bear in mind that first 30-60 seconds is going to hurt like a son of a gun.