What kind of tank are you going to have: reef, FO? Do you have any test kits already? The most important ones to start off with are Ammonia, Nitrate, and Nitrite, (also get a refractometer to test salinity if you dont have one already)so you can tell when the cycle starts and ends. Once you start adding live stock your also going to want to get PH, and phosphate tests. If you go reef your also going to want to get magnesium, calcium, and alkalinity tests.
Feduke