Good advice from Carl. Just a couple of thoughts from me.

You won't have any CYA in fill water, so don't waste the reagents testing for it until a full week after you have added some as it slow dissolving. No reason to waste reagents.

Also, you may not need muriatic acid. No reason to buy it and store it if you don't need it. If it were me, I'd wait before buying that to see if your pH is high and you need it. I never need it in my pool. Just my $0.02.

Regarding the test kit Carl recommended ---- YES! Buy it! You'll be so glad you did. But, when you click on the Amazon link in my signature, only buy if the seller is Amato Industries. Some other sellers are substituting the K-2005 which you do NOT want. Occasionally, today being one of them, you get another seller shown when you click on the link which means they are currently out of stock. (They do have the 2006C kit however, which is the same kit as the 2006 but has larger quantities of some of the most used reagents.) At any rate, they usually are re-stocked really fast -- like within a day or so if you prefer the K-2006 kit.

Welcome to the forum! (We've had quite a few new members from LA this year which is where one of our mods (Aylad aka Janet) is from.