No idea about the sebright.
Silkie white is recessive, so the offspring would not be white. Likewise, the feathers would not be silkie.
Type is most likely to be d'uccleish (is that a word, lol? I know this from experience.
Personality should be very, very nice.
Comb type will depend on whether the silkie's comb genes are hetero- or homozygous.
Yes, the offspring should have beards and foot feathers. Most will have 5 toes and dark skin. Some will have small crests.
Colour will depend on the genes hidden by the silkie's white. Could be anything, but chances of something approaching partridge are likely.