New to this...

Two decisions to make. How are you going to chlorinate it and how are you planning on testing it? I'd get a gallon of bleach in there pronto---at least 6%. You're at least gonna need some CYA to help protect it--available at Walmart. We'll need GOOD test results to advise further. Read up on the basics in Pool School here (button top left of page) and consider a TF100 test kit from TFTestkits.net. Please add a signature line to your profile listing your pool equipment and pool particulars. Welcome.