America - Front
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Levels 1-10: after you come back to life in Rien, there will be quite a few Aran quests. Complete them and you should get to level 10 in no time.
Levels 10-14: after you make the first job advancement, like the Cygnus Knights, you will be given a place to train in Rien. Training Slimes, Training Orange Mushrooms, Training Pigs will give adequate experience.
Levels 14-20: you should go to Victoria island, and a few quests will be waiting for you. Complete them to level up quick. Or, you could participate in the Henesys Party Quest, but with the melee attacks, it would be pretty hard attacking those flying monsters. It still gives you good experience at the start though. Once you go at about Level 15, Rowen the Fairy at Ellinia will request you to kill Green mushrooms and Sickly Green Mushrooms. They will give great experience and might drop goodies such as a pan lid, which is popular with Bandits and can be sold at a high price. If you can one or two hit Horny Mushrooms and Zombie Mushrooms and are ready to burn and spam pots, you might try Ant Tunnel.
Levels 21-25: KPQ is available now. But don't do it yet, because you lack dexterity, which is a pain when fighting Ligators and King Slime. Instead, do lots of quests, and a new character in Perion will request you to kill Depressed Ghost stumps. You might do this quest at the same time as Winston's Planting Trees quest. You are ready enough to go down to Ant Tunnel, so gown down there and Kill horny mushrooms and Zombie mushrooms.
Levels 26-30: now you are strong enough to do KPQ! It gives you lots of easy experience and rewards, such as ores. But don't forget to do quests, as the NPC in Perion this time wants you to kill Zombie Mushrooms and Murderous Zombie Mushrooms. A great place to train is 'Cave where mushrooms grow' mini dungeon in Ant tunnel, where large amounts of Zombie mushrooms and Horny mushrooms spawn. At lv 29 you will have to kill Francais (the puppeteer)'s cave in the evil eye cave 3. It isn't so hard, just bring at least 10 white potions and 10 blue potions, and you'll do just fine. Or you could go to Orbis and kill Jr. Stentinels, but it's a bit slow.
Levels 31-35: complete the 2nd job advancement. You will have to kill Scarred Bears to complete it. If you did it, congratulations! However, even though you might go to Carnival Party Quest, you are not likely to get chosen, and you will likely lose and get harassed. Skip it for now, and just go to Mushroom Kingdom/ Orbis....