When first setting up a tank the 3 most important things to test for are Ammonia, Nitrite, and Nitrate. The problem with purchasing Ammonia and Nitrite test kits is that you will most likely not need them again after your tank has cycled. So it is up to you as to whether or not to purchase these tests. Most LFS will test water for Ammonia, Nitrite, and Nitrate for you for free. As soon as Ammonia and Nitrite has hit 0 and Nitrates start to rise then your cycle is nearing the very end. At this point I would do a 10-20% water change and you should be ready to start stocking. This process will take around 4-8 weeks.
After the cycle the important things that you will want to test for are PH, Alkalinity, and Calcium. (Nitrates too if you are having algae issues, phosphates are tricky to test for as there are organic and inorganic phosphates and different tests read differently, but I would not worry about this unless you are overwhelmed with algae)
I don't remember but I think you said you are going to use RO/DI water right? What salt mix are you planning to use?
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