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I finished the tutorial but im playing the gog version as i understand the latest edition.

Is there a tutorial. I was not able to buy apples from city market or from npc orchards. 

is it only possible to build your own value chain? or can you buy raw materials from other suppliers aka world market? and can you buy goods from the city market when the price drops to below equilibrium then sell it back after the resource/commodity is depleted and is in demand at equilibrium price again, the way you can do in Rise of Venice? This way you can have a warehouse in one town where you buy goods that are produced there and transport them to a warehouse in a town where that commodity is not produced and tell it to sell it at the rate of consumption, and if the margin between the two towns is higher than cost of delivery you can have a nice transport arbitrage? 
I hope what I have written makes sense... 
Thanks.