OK. Checked and entered your Pool Chart data -- your gallon figure was off. A 24' round with 54" walls would be 13,200 gallons; if you have 48" walls, it would be only 11,800 gallons. So, for now, your PF is 9.1

With a PF of 9, a gallon of bleach will be about 4.5 ppm of chlorine. If you add 1/3 in the AM and 2/3 in the late PM, you should be OK.

Once you have dichlor, adding 1/3 of a pound in the AM, and 2/3 of a pound in the PM will produce similar results, and will give you about 30 ppm of CYA after 7 days. Don't bother to test CYA, till you've added a total of about 14 pounds (~60 ppm). Do cut back on doses, once your chlorine starts 'holding'.

Run the pump 24/7 the first week, or really, until you can hold a chlorine level throughout the day.