Welcome!
First off, don't panic if the water looks like mud. Big chunks of rust are much easier to get out than a green tint.
Second: don't panic if the water looks like tea or lemonade or even lime green.
Third, don't panic if it looks okay at first but turns colors as soon as you add bleach.
We've seen all three scenarios, even on trucked-in water, and we can walk you through it.
Of immediate concern is a test kit. I hope it's already ordered. You won't find a good one in stock locally, I'll wager. I live in the land of swimming pools, and I've seen a K-2006 in a store exactly once, and it was the big commercial kit at a Leslies that deals with commercial accounts. And they didn't stock the refills. Order from
TFTestkits.net tonight and it'll ship Tuesday and you might just have it in your mitts before the water truck arrives.
You can be sure the water will have no chlorine (or so little it doesn't matter) and no CYA in it. So you can actually deal with that stuff without a test kit. With no CYA in the water, your chlorine target is 3 FC. That's half a 121 oz jug of standard 8.25% laundry bleach. You can eyeball that.
To get to 40 CYA in your pool will take 4.5 lbs of CYA granules. It's sold in 4 or 5 lb canisters depending on brand. Buy whatever your local store has and add the whole thing via the sock method in
Pool School - Recommended Pool Chemicals Don't waste a bunch of time driving all over hunting for one size or the other, just grab a canister and go. Either size will get you to a reasonable number. No need to overbuy. See how much money we've already saved you?
pH and TA adjustments will require a test kit so you can plug numbers into
Poolmath
A note on that: If your pH is close to 7.8 but not quite there and poolmath says the ideal is 7.5 to 7.8, don't go picking the midpoint as the target. Just plug in what you think your current reading is and
voila! no acid needed. You have a range, so don't arbitrarily pick a middle number and then agonize and micromanage it to get perfect. Same goes for TA. If it's high, big deal. The range is 50-90+ If you're below 50, you need to add so pick a number between 50 and 90 and go. If you're above, put the now as target. Hey, you're balanced!
CH isn't needed in a vinyl pool. So a low CH is no problem. HIgh CH can be, so you need to know that number for reasons too advanced to explain this early in your second career as a mad scientist. But know you won't ever have to buy any Calcium Increaser. More money saved.