This quest starts right as East Empire Services ends. Sha'khar will tell the player they have an additional service available the player might be interested in.
If the player declines, Sha'khar will remain at the East Empire Camp Whiterun in case the player changes their mind.
If the player accepts, Sha'khar will explain his plan to sell items for the player. The player will then receive an objective to give an East Empire Merchant some items to sell, and an optional objective to instead use an East Empire Relic to send items for sale.
At this point, Sha'khar will ask the player if they could do him a favor; accepting this will start the third quest. If the player declines, they can return here and speak to Sha'khar to change their mind.
The player can speak to the East Empire Merchant and hand over items to sell, or use an East Empire Relic in a container, and tag the container as "To" the East Empire Company.
Note that like most base game NPCs, the East Empire Merchants are mortal. If killed, they will respawn when the cell resets, which happens after 30 days in-game. If the East Empire Merchant is dead, players can still complete this quest by pursuing the optional objective of sending items via an East Empire Relic.
Once the East Empire Merchant has items to sell (from either method), the player will receive an objective to give the merchant time to sell their items.
After the first sale of items, the player will receive an objective to collect their share of the profits - which will point them to the Strong Box (Your Cut) item on the table at the East Empire camp.
Activating this Strong Box will complete the quest.