You can accept Quests nows ^^
These are taken up in-Rp at Clan HQs from NPCs, or even other players.
There is a 'notice board' section that has both player and NPC quests here
Quests will always have a reward of some sort - a 'mod' reward and a 'player' reward.
Mod rewards are things like LVs and Titles (titles being rare and LVs determined on the likely difficulty of the task - the higher the risk, the higher the reward).
Player rewards are items, money, even TMs from time to time.
When a player puts up a task, they must back it up with some sort of reward, though, however, clans could back up player's requests, coughing up rewards from their own coffers rather than the player's - yet another incentive to be part of a clan ^^
Simply follow the rules in the Notice Board and you can't go wrong