Try this. Start off at Riga and work your way to Bordeaux. Pick up 50 of each type. Depending on your level/storage ability, it may take a while. Once you get 50, stop buying. Your goal is to get 50 of each totally 15 different local specialties. Once you are full (be it 50 total or 750 total) sail to Famagusta and sell it all there. Do not stop go, do not collect 200$ USD. Once you have done this, you sail back to Riga and start over or try creating your own local specialties 15 different type trade route.
North Europe
Riga: Heathers, Feathers, Amber
Stockholm: Heathers, Flax
Visby: Flax, Akvavit (Not for Muslim or India ports)
Danzig: Amber
Lubeck: Feathers
Copenhagen: Amber
Oslo: Flax
Bergan: Akvavit (Not for Muslim or India ports)
Germany
Hamburg: Lily of the Valley
The Netherlands
Gin: Amsterdam, Groningen (Not for Muslim or India ports)
Chamomile: Amsterdam
Dutch Calico: Amsterdam
British Isles
Whiskey(Not for Muslim or India ports): London, Dublin, Edinburgh,
Flannel: Edinburgh
European Armor: London
Glasswork: Dublin (Do not sell in Italy/Southern France)
Northern France
Fruit Brandy(Not for Muslim or India ports): Nantes
Apple Vinegar: Calais
Dried Apples: Calais
Bergamot: Bordeaux (French only)
Lilac: Nantes
Goblin Tapestry : Calais (French only)
Iberia
Lisbon: Almonds
Sagres: Muskets
Click here for a list of other local specialties
Information on how the 15xlocal specialties works out