Titled vehicles require a title transfer and a shipping agent to act as owner for transport and clearing. If you purchase the vehicle overseas, you must still grant power of attorney to an agent.
Motorcycles require racks, shipping crates or other immobilization that is specific to the shipper.
Find an agent first then find a shipper. They will provide all of the requirements on time and location to load and delivery date.
Once landed, you or an agent must present title and bill of lading for the container. Then dumerrage, vehicle tax, VAT, and other costs are calculated and paid.
If given a choice of buying a used motorcycle from overseas, shipping, clearing, and registering it versus buying one from a dealer or vehicle importer, most people will buy one from a dealer or importer. And for a good reason, too.