Izopnd, welcome to AQC…
Two little details up front. Try paragraph spacing to break up individual ideas (it makes posts easier to read). If you have a new question start a new thread (tagging onto the end of someone elses isn't going to get you as much of a response, especially when the original is three years old).
Your LFS sounds a little old school. They aren't giving you the best advice.
Where are the goldfish now and where are they going once the cycle is established? You're doing a very old school 'fishy' cycle: fishless is a better, faster, easier option. If your going to continue with the fishy, we can help you through that. Personally, I'd take the goldfish back and do a fishless.
Levels are information. They're never 'fine', they all mean something. It'd be good to know pH, temp, Ammonia, Nitrites, and Nitrates for instance.
The white cloudiness is a bacterial bloom that isn't unusual in cycling tanks: it typically goes away on its own in a week or two. Amquel and Prime are two good water conditioners that'll help detoxify your ammonia while leaving it bioavailable to the good bacteria. Don't pull your hair out.
Change out enough water that you can make a decent reading on the Ammonia and let us know the pH and temperature (they make a difference).