Hi malloandson, welcome to TFF!
I agree with tenohfive. A good liquid-reagent based test kit like the API is one of the most basic and best things a beginner can have. Once you bring one home, practice the tests by testing your tap water a few times, then test your tank water.
The kind of question you are asking is worked on a lot over in the "New to the Hobby" section and you can start a thread there and keep it going with more questions. Its also a good idea to enter your geographical location in your profile as that can help members give more tailored help sometimes.
Another thing you could look into is contacting your water authority lab to see more about that KH. Ask them if they can give you some numbers for what the KH (Carbonate Hardness) should be in their system. If your water is very soft, it could be important to know that when trying to cycle the aquarium if its new.
How long have you been running the aquarium, what size is it and how many fish?
~~waterdrop~~