The first order of business, IMO, is to get a proper testing kit, some Seachem Prime, and begin doing daily water tests and WC's as necessary (if ANY ammonia is present, for starters).Not sure what your starter kit was but to be safe, get some bacteria in a bottle and pour in near the filter intakes.
I've no idea what this "starter" kit consists of, and it doesn't matter, the basic premise here (I'm betting) is a fish-in cycle, they aren't hard to do, but they are tedious...much testing and many water changes, daily.
No need for bottled bacteria, though the "kit" probably came with some form of it...waste of money, the bacteria we need to cycle our tanks is already in our environment...free of charge.
SarahBeth, have a good look at this section of the forum: Rescuing A Fish In Cycle Gone Wild - Part I
I started out in the hobby 8 years ago, when my daughter's story with her first fish tank was very similar to yours...and I reached out to a forum like this for help...and learned about cycling with fish, because of bad advice from employees at a local pet store.
You may have been given bad advice at the store, I don't know, but it is common.
At any rate, I recommend this: https://www.amazon.com/dp/B000255NCI/?tag=ff0d01-20
And this: https://www.amazon.com/dp/B00025694O/?tag=ff0d01-20
And follow the cycling instructions linked above
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