Well I advice to complete as less side quests as possible in the early days. Killing mobs in the wild will provide enough exp for you to level up and take on the main quests. Only turn in all your non main quests before the fight with laiken and you would be suprise how many good deals you going to get from quest rewards, as well as locked chests. During this second play through, I manage to collect more than 100k of gold before facing laiken. Many locked chests content, especially weapons with high hp/mp can be sold for very good pricing, from 500+ to 1k+ gold each. And you basically wont need any of them if you keep the right quests for better reward, which is legendary items.