Newbie - Need Help on Water Chemistry

Hi All:
I have a new system setup and running for about 3 mnths now. Only LR and LS are with for now.
The Test Kit I bought with me when setting it up was the Marine Master Delux Testkit which help me testing 4 elements:
- Amonia - I cannot match with the chart (They said: It means OK ?!?)
- Ph - 8.2 or 8.2 (color doesn't seem to be exact matched)
- Nitrite - Can't match the color chart (They said: It means OK ?!?)
- Nitrate - Still, I cannot match the color chart (They said: It means OK ?!?)

So, my question is, are those, I tested, seem to be right? Did I do it correct? What else do I need to perform except those 4?
Oh, I forgot, my system is tend to be reef system with afew fishes.

I appreciate your helps.