I would also test a sample of the fill water. You can actually add bleach as it is filling. Once you get a foot or so in there, drizzle some bleach in around the perimeter of the pool, reaching as far from the sides as you can. Then stir the water around with a clean broom or something. Do this again when you get another foot of water in there. Just small amounts.

Until you get some CYA (stabilizer) in the pool, you'll find that your chlorine disappears FAST! So, for the first few days, you'll have to add bleach 2 or 3 times per day. Once you start getting a CYA reading, you'll be able to test it and dose it with chlorine in the evenings only. How do you plan to add CYA? Separately? Of use dichlor for awhile or ???