What are some products that I can get that will treat these chemical, pH, etc. levels?
Buy declorinator - if your water needs it
The best thing you can buy is a good filter.
The best thing you can do is water changes.
The next best thing to do is not waste your money on chemical garbage you or your fish don't need.
PH <--- is a big overexagerated MYTH! If your fish are alive in a ph different from whats "reccomended", as long as the PH is stable leave it alone. Stable PH is better then always trying to adjust it and I say always because thats how chemical adjusters work - add this,add that - never ending cycle.
I get overwhelmed when I see all of the products you can buy.
Marketing

The more you think you need, the more money someone gets out of you.