tank dosing

Very new to the saltwater hobby so forgive the newbie question, but I'm wondering what and when I need to dose in my tank.



Right now I don't have any corals as I'm just starting up so first off what do I need to dose and when for the health of the tank itself?



Second, when I add coral (LPS, softies) what do I need to dose for them? Food for them? Calcium?



Thanks!