For a seaborn attack make sure that you build large fleets to help handle the smaller navies that the enemy builds. Generaly it is a good idea to make a few large fleets to control the seas rather then with several tiny ones.

When you blockade a port go ahead and use one or two ship navies for the job and keep your larger fleets as sentries running down on any approaching ships that may have their eyes on your blockades.

Devoirs The Empress