Frankly that is one of the worst corals to pick period-let alone as your first. You have set yourself up to fail and the life of the animal to be lost. I did the same thing when I was a newbie, the are definitely beautiful corals.
Goniopora's are generally from lagoons/intertidal areas. These areas are "dirtier" than the outer reefs we hobbyist generally try to simulate. They have an abundant amount of plankton and other nutrients available. So, along w/ good lighting Gonioporas need plenty of available live zooplankton and phytoplankton along w/ other minerals etc. Much more than most hobbyist can add, let alone maintain, w/ out fouling their tank water. They are definitely not for a beginner or intermediate hobbyist.
FWIW one of the advisors has fellow members of her reef club that not only have managed to keep them healthy, but also nurse sick specimens back to life. They have provided much info. on other forums regarding their husbandry practices.