Explorer gathers items and money, the items are used by other professions (best starting class, I'd suggest doing 2-3 pets on Explorer for 2-3 days)
Doctor makes medicine for when pets get sick
Animal Husbandry breeds the "petpets"
Warrior fights to get money, more items (which are used by professions) and to keep the village safe from monsters
Consctruction constructs houses and other things for pets to live, I don't know much about this one but it's definitely not useless
Crafter no idea
Tailor makes costumes (equivalent of paint brushes)
Blacksmith makes weapons
Herbalists grow plants
Alchemist makes the equivalent of morphing potions
Quick FC is to get many explorers and sell stuff to players or through the buy back option (except the plants, grow the plants first then sell)