Status: Ivestigate and find Masyaf's traitor.
Go the center of the village to do your first eavesdropping mission. Sit on the bench, target the pair of talking people and listen to what they're saying.
Now it's time to steal something (in fact it's your first pickpocketing mission). When your target leaves, go after him. Move close to him, and take what you need.
Interrogation is the last task you need to do. Target your victim, go after him and give him a beating behind the building.