- For money, I usually just sell everything I get on the bazaar. This includes weekly rewards from 強戦士の書 (
unlock quest, from 超お役立ち機能).
Daily/weekly 討伐 quests also can get you ~20-40k per day and ~100k per week. Honestly though, not even necessary as you rarely need money in the game.
- For gear, both for weapons and armors you can get it for "free", as I explained
here. If you have 1 class high enough to access this content, you can use it to grab gear for other classes as well.
You can get items to access the dungeon island from exchanging your game time by the way. You will probably need a bunch to get the full set of armor.
- Regarding leveling up classes, since the games hands out metal labyrinth tickets like candy, leveling up your sub jobs is super easy. I would recommend you looked at passive bonuses you can get from each one and level those first. You should get enough XP through playing the story/daily/weekly stuff that hitting the cap on your main class should be a piece of cake. After that, just switch to the next class before handing the quest over so they get the xp.
As for weekly battles from 強戦士の書, since you can just get a group of super high npcs, you can go there even at a super low level for the xp.
Never forget about 元気玉 too, they're super easy to get anyway.
Don't forget to use all the item codes in the main menu -
most should still be active.