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You'll get 50% NN cochin mix, and 50% non-NN cochin mix. You'll have to keep breeding for quite a few generations before you have a phenotypically pure cochin

In this case, some of the offspring will bot carry the gene at all, and some will be heterozygous, like the parent. Breed the heterozygous NN cochin mixes back to the cochin parent

Heterozygous NN birds have a little patch of feathers on their otherwise naked neck. Homozygous birds don't have that. Their neck is completely naked

I'd breed back to the cochins, then. Be careful that the mixed birds you're breeding back to the cochins have the NN gene. Is your starter NN homozygous or heterozygous NN?

Depends on what your goal is. Probably try to avoid sibling pairings though