You should check out the Adventurers Guild. You can accept 8 leve quests at a time, take them to the specified camp, and complete their objectives after activating them at the camps Aertheryite Crystal. It's a decent way to solo experience. Also Paladin is a advanced version of Gladiator, by doing the paladin quests you will unlock gear and abilities to further enhance paladin. It's mostly used for group situations though.