The order of the game is:
*Ships advance when players purchase their color.
*Most of the times several ships will advance at the same time (but not always).
*When a ship arrives to the port of Edo players will sell their goods with the pre-stated formula.
**At the same time as at least one ship arrives to Edo (since several could be arriving in the same turn)all the ships in the red tide spaces (previous two) will have to protect their goods, This is the only moment when a player can protect goods.
*As long as no ship arrives to Edo the players have no need to protect goods.
Hope this helps.
***Also hope I made no mistake since I have started playing recently.