So the fish died not from chlorine, but because the tank is still cycling. Don't buy any more fish yet, add an ammonia source- either a raw shrimp or use actual drops of ammonia and let the tank cycle for a few weeks. As soon as your test kits arrive, check for ammonia, nitrite and nitrate every day. When ammonia and nitrite spike and go back to zero, then you are cycled. At that point, do a water change to get nitrates below 40 and then add a fish.