I always keep a mixed flock, but I'm 2 for 2 on a black copper marans going broody in her first year. I had speckled sussex, one was a good mama and one bad, right now I've got the BCM, cochin, and HRIR broody. I haven't let them gave hatching eggs yet. SOON. So far they all seem pretty determined, though the BCM usually wins for most eggs at the end of the day.
The powdered milk from TSC. I started with baby bottles from dollar tree, but had to get the black rubber nip on a coke bottle for Beaux. Had to fight him a solid week, 3x a day, til he learned to take it. They're ~4.5 mos and still just the sweetest little babies.