TehWizarde's awesome guide to magicians
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This is not the perfect guide but it will surely help you advance to the second job advancement. And of course you don't have to follow this.
Level 1-7 Green snails and some quests of maple island. And blue snails if you want to.
Level 8-15 slimes, red snails, stumps and maybe orange mushrooms. Be sure to do this on Victoria Island.
Level 16-20 slime tree in Ellinia or pigs at Pig Beach. Be sure to have lots of hp potions.
Level 20-23 green mushroom tree in Ellinia. Place to rest - relaxer near the portal. Have lots of potions.
Level 23-25 Horned Mushrooms at the ant tunnel or at the mushroom tree in Ellinia.
Level 26&27 Zombie Mushrooms and Horned Mushrooms at ant tunnel I.
Level 28-30 Masks at Excavation Site III. Good exp and drops. (In 1 day, I got level 30 bowman gloves, red lutia, bowman hat lv 20)