IME, corals are simpler to keep than fish. If you want fish first, you have to be careful not to get any that will eat your corals that you add later. (angels, triggers)
If fish wind up fighting, you can't really separate them, like you can with corals. In the case of fighting corals, you can just move them to opposite ends of the tank, or in the case of leathers and the chemicals that they expel, adding carbon every now and then will do. Fish get diseases quickly, and can die quickly. Corals usually recede first, giving you time to find the source of their ill health.
I view most of my fish as being there for the tanks' and corals' benefit. (herbivores, waste producers).
Keep a simple coral, like a mushroom, first, to learn from it and boost your confidence when it reproduces. From there you can go to soft bodied corals and others. By that time, you'll know enough that you can try some more challenging ones, and aquire the appropriate equipment.
Mitch