This long, strange quest-line starts with Ghassan the Trader the docks in The Sinking Sands. Spoilers and order of first quests is needed, 'cause it's been a while since I started it.
Order is:
- Hides for Ghassan
- Spice Delivery
- Venemous Venture
Unsure of order:
Correct order (but some could be missing)