Contracts are generally fairly simple "Fetch X amount of Y for Z person" quests. Each one is radiant, so the item to get, the amount of item to get, and the NPC to get the item for will always be random. As your Skinning Skill increases you will be offered contracts for higher quality pelts, but only if you're known for quality through your Quality Skinning ability. Contracts are obtained from a Guild Porter on request.
Sometimes small quests to achieve certain things (like killing problematic Rabbits for a farmer) fall into the Contracts category. - Coming Soon
Contracts can fall into 3 different levels.
Most of the time certain contracts are only available in a specific Guild Hall, as detailed below. The following is a breakdown of all available contracts. Unless specified, all contracts are radiant and repeatable quests.
Whiterun Guild Outpost