I'm here to help.
Hopefully if you cycled correctly you won't lose any fish. That's the point of cycling. It's adding the bacteria that get rid of the most harmful chemicals (namely ammonia - it kills fish faster than any other problem), so that your fish can live stress free.
I would recommend testing every day or every other day... and make sure you keep note of what the water parameters were for that day. I can give you an article on cycling if you need to read up on it. Just let me know.
Live plants would help the oxygen level, and they are also a little more difficult to take care of. I'm not sure whether you have the experience or not, I'm just letting you know just in case. They need lots of light, and that may lead to algae blooms, which would not be good.
If you are going to have a lot of plants, I would say an airstone isn't necessary then. However, if you notice your fish gasping at the surface (they probably won't, but if they do) then you need an airstone.
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Phishie

"An ounce of prevention is worth a pound of cure."

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