Hi there! Welcome!
It helps to have a few key pieces of info:
Pool make-up: Vinyl, fiberglass, plaster, etc.
Filtration and Pump Info
Qty Gallons
Any accessories
Also helps to know your fill source!
Are you equipped with a good test kit? If not, throw those terrible strips in the trash, and get yourself a good test kit!
Plenty of articles to review in the mean time! Take a trip through pool school and make yourself familiar with chemicals. Download the pool math app (and if you’re up for it - it’s worth subscribing so others can see your chems).
I filled to about 75% before considering chemicals… and then ran into a series of my own issues (rust and other things)… I had to SLAM and deal with rust in the same breath.
Let’s get some of your basics going and the brains around here will get you where you need to be in no time!