There are a lot of good stores around the metro area I have built a 30 gallon reef years ago. Fair warning you will want a much larger tank shortly after getting going because it’s awesome!
My advice is to plan out what you want and how much you have to spend. There are many ways to skin this. Read Revs thread about how to plan a build.
For a nano tank I would get an ATO and plan on doing weekly water changes to handle replenishment use a salt that is close to NSW so you don’t see large spikes in values that will be hard on livestock. If you go heavy on corals or plan to then start by testing alk and dose two part accordingly if you have a need. As far as trace elements you shouldn’t have issue if you keep up with water changes for instance if you chang 5-8 gallons weekly like one Home Depot bucket or one and a half and with displacement you have a volume of 25 gallons on a 30 gallon tank that would be 100% monthly water change so those would for sure be good. If you buy the salt in bulk 175 or 200 gallon boxes like Red Sea blue bucket aquaforest reef salt or instant ocean regular you’ll get the best bang for your buck and the will last along time.
Also- most people prefer to make their own water you can buy it from a LFS but it’s exspensive in the long run exspecially in AZ you need to use RODI water to have 0 TDS water spectrapure is located in Tempe and their systems are designed for saltwater aquariums worth a stop (and purchase) for sure. If you buy from a store just buy the RODI water and mix salt yourself.
Equipment:
Tank
Stand
Skimmer - hang on back or sump depending on tank choice and what kind of tank
Lighting-depends on livestock choice types of coral ect
Refractometer- I like digital ones I have the Milwaukee version
test kits-
alk -if you keep corals to see you weekly depletion between water changes and if you need to supplement you can buy others as needs or curiosity arises
Nitrate and phosphate - once your up and running to help you watch for high nutrients
Cycling test kit ammonia and nitrite
Tank Cycle research this many ways to do this bacteria ect once your set up then start adding creatures.
How to run tank ULNS Zeovit, live rock based traditional, Red Sea colors based, aqua forest pro dio system this will help you pick if you need a sump or equipment needs if you choose live rock traditional get some ceramic hidden in your tank somewhere like exportbio from brightwell. A lot of these systems are designed for bigger systems where 20% monthly water changes don’t keep up with system demand for trace elements and vitamins and also add amino acids and foods for corals.
That’s my 2cents.