I've looked everywhere and cant find any documentation on how to set up a fishing loot table. If anyone else has figured this out I would greatly appreciate some guidance. Thanks in advance.

Well according to the coding:

    //Check if there is a PhatLoot for Fishing
    PhatLoot phatLoot = PhatLoots.getPhatLoot("Fishing");

You just have to define a phatloot called "Fishing", hope that helped :)