100% agree with @jaren45. Before you start adding corals, you may want to start testing for Alk, Cal and Mag. Just to get used to the testing regime and get a feel for the tank's parameters. Initially, your water change schedule will probably be enough to replenish your major elements. As your coral's demand for the major elements starts to exceed water changes, your testing will let you know and you can start manually dosing every few days or weekly. Over time, you've gotten used to the rhythm of the tank, you will see the demand increase, and will just know it's time to start autodosing.