Welcome!
It would help to know what chemicals you have on hand and what test kit, if any you have.
With a fresh fill you know there's no CYA and not enough FC to matter. If the abbreviations make no sense, check out
ABCs of Pool Water Chemistry to learn our lingo. Your pH could be high or low or in the safe zone. That has to be tested to know what it needs. Total Alkalinity is in the same category. The good news is low Calcium Hardness doesn't matter in your pool, so you don't need to test it. What could you do if it was high? Refill it with more of the same? It's nice but not necessary to know that just yet. You want that pool swimmable.
So... with no CYA in the water yet, target FC is 3. A whopping 2½ cups of standard 8.25% laundry bleach ( no scented or splashless stuff) will get you there. You probably have that in the laundry room.
To raise CYA requires stabilizer. It will take less than two pounds but the stuff is sold in 4 or 5 lb canisters. You can also get stabilizer in some powdered forms of chlorine. So if you have anything that came as samples with the pool, or some neighbor handed over some leftovers, let us know.
Then you need to adjust pH. That's where you need a tester to know which way to go and how much.
So go ahead and add some bleach now. Your kids bathe in the same water so it won't kill 'em if they get in before the rest is settled, but they may end up red-eyed since they don't usually spend hours under the bath.
Then post back and let us know about test kit and available chemicals.