To set up a shop, I require ten percent of all profits as payment for rent, including payment for the guard force and basic Market upkeep. A stall costs half that, but I do not believe one such as you could provide a service in quite the same way from a cart as other vendors do.

Arrangements could be made for reduced rates for the other businessowners in the Market, but I would have to see what you were capable of as a courier first and foremost.