Go along the mountains east of Marrakesh. You'll find a narrow pass leading into the hot Saharan sands. From there it's a long, long trek across the burning desert. If Timbuktu is under Moorish occupation, make trade rights with them and send a bunch of merchants there right away. If not, send a small fast force to take it from the Rebels. The gold, slaves and ivory there is well worth it.
To get to Arguin go west from Timbuktu, along the African Sahel. You won't be able to arrive by sea until you get Carracks. There's some gold/slaves/ivory here as well, so it's worth the trip.
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