If you just want to grind, there are plenty of mobs that you could level up on in the southern part of orcville. However, if you would like to start making some money, go to Gludin Village and start using the manor system.
Repeating the quests at the starter village are not going to make you rich very fast.
If you've managed to complete the class change to Raider, I'd stay on the mainland. You can get your newbie buffs from the guides on the mainland just like in Elmore.
This is mainly because the repeatable quests in Elmore are mostly below your level now. All but the Kasha Bear quest mobs will be purple or lower so you can no longer stack quests effectively. Since you can no longer stack the quests, you may as well stay on the mainland and do the quests there from Gludin/Gluido towns.
If he's a Raider in a mixture of NG and D grade gear, he's better off grinding on the sub-20 mobs that are around Gludio. I'm going by board join date, so I am assuming he is a true newb to the game and doesn't have the funds to be decked out in D grade which makes it so easy to level around Dion.