Janet has given you good advice to help you get started. Just a couple other things that may help you.

When you buy the stabilizer (CYA), you will need about 9 lbs. for your pool. That will give you a reading of about 40ppm of CYA which would be a good level. When your pool is filled and you get the pump running, add all 9 lbs. of it slowly to the skimmer (so it won't clog the pipes) while the pump is running. It is slow dissolving stuff, so you'll want to keep your pump running 24/7 for at least the first 4 or 5 days while it is dissolving in your filter. Also, don't backwash during that time period or else you'll just throw it out. (You shouldn't need to backwash a freshly filled pool the first week anyways.)

During that first week until the CYA dissolves, you'll lose your chlorine quickly to the sun so you'll need to test in the morning and in the evening. If you are home in afternoon, you can test then as well. Each time you test, add enough bleach to take your chlorine back up to around 5ppm. I estimate your volume to be approximately 28,700 gallons. (Pools are not filled to the height of their walls. The water level is usually about 4 inches lower than the top rail.)

For reference, in your pool, each quart of 6% bleach will add 0.5ppm of chlorine. You can use that to help you determine how much bleach you need to add to get back to 5ppm. After the first week when your CYA is registering (on that good test kit you're gonna buy!!) you'll be able to go to testing and dosing with bleach in the evenings only. With a CYA level of 40, you'll want to keep your chlorine between 3-6ppm ALL the time or you'll risk an algae bloom. (Take a look at the Best Guess Chlorine Chart in my signature below for more about the correlation between CYA and chlorine levels.) My recommendation is that when you get to the point where you are doing evening testing only, add enough bleach to take the cl to 6ppm. If you find that by the next evening when you test again that you have dipped below cl of 3ppm, then take it to 7ppm that evening instead.

BTW -- As you are filling the pool, you may want to drizzle some bleach in as ever foot or two of water is added. Just walk around the perimeter of the pool and slowly drizzle some in reaching as far from the sides as you can. Be careful not to splash it on you or the liner.

As Jan said, posts your testing results when you get them and somebody here will help you tweak them.

Welcome to the Pool Forum!