Pool Calculator can do the math for you. Bookmark it; you'll be using it constantly. Enter your pool size and your current readings. Down near the bottom it asks for surface finish and chlorine source, enter those and "troublefree pool" for suggested levels. It will then give you appropriate target levels which you can enter in the target column. Then it's a simple matter to add what it says.
First get that pH down. Muriatic acid is the cheapest way to do it. They sell it at big box hardware stores, and any big box store that sets up a pool display this time of year. You'll also need "stabilizer" aka CYA aka cyanuric acid. That can come from the same place as the acid, most likely. Measure out about 3/4 of what
Pool Calculator says to add in a sock, tie it off, and hang it in the pool in front of a return jet. It will take a few days to dissolve and a week or so to register. Then see what it says and add whatever
Pool Calculator says you need to finish. I recommend undershooting because it's easy to add more, hard to get rid of it if you overdo it.
Pool School has some very good articles explaining pool chemistry.
Even if you're on a
really tight budget, spring for a good test kit. It will repay its cost 2 or 3 times in the season by what you save not buying unnecessary pool chemicals. Don't skimp here, that's penny wise and pound foolish to the extreme.
