Ammonia is really no good for fish! I'd like to say that they'll all make it, but some of them may not be as strong as the others, and may succumb to illness, or die. However, getting that water quality fixed will ensure that if someone does get sick, they can be treated and have a better chance of making it. This is a big ordeal for them, but hopefully they'll pull through if you keep that ammonia level low, and later, when it gets to nitrite, keep that level low. Cycling a tank with fish inside of it that you care about is one of the hardest and most labor-intensive aspects of fishkeeping, and is best avoided, but it's a little late now, unfortunately. Just read, read, read, and understand the nitrogen cycle in and out, and give the same care and attention to your biological bacteria as you do your fish -- that bacteria is essential.