After your car has been shipped and after you obtain relevant documents from your seller, its time to contact an agent who will clear your car at the port.
Look for a reputable agent. There are con agent, and they literally milk importers of their money. Some agents colude with TRA officials to threaten u with the infamous "uplifting" to sqeeze more money out of you. Also there are un-trustworthy agents that steal parts, such as radio or CD player, after the car has been handed to them and before they deliver it to you. So some due diligence is important before you pick an agent.