THere's a sticky file up top, a monster titled SETTING UP, which is actually a master file of 'how to' and what to do. I'd say start there, and take notes.
Parameters that I use are as follows. Temperature 79-80. Salinity 1.024. Alkalinity 8.3 on the DKH scale. Phosphate 0. Nitrate under 10. Ammonia 0 [it's poisonous, so it needs to be 0 at all times]. Calcium 420. Magnesium 1300.
First advice, get a ro/di system and make your own salt water. Get boxes of Instant Ocean, eg, which will give you pretty close to the readings above on mixing it. Get a refractometer.
Keep a logbook of your tests and the results. Don't trust your memory.
Don't add things except pure ro/di to make up evaporated water; salt water, take 10% of the tank water out a week, put just as much new salt water in.
Put away all the bottles of 'stuff'. Just maintain it on those simple changes until you have corals.
Proceed with your plan for the big tank and good luck. Mixing your own salt water is definitely best. 1/2 cup of Instant Ocean salt mix to 1 gallon of ro/di will yield you very good sea water, and do not add anything to it---just the water drawoff and add, every weekend, until you get corals.