When playing the game, you can go, system -> operation and change the mouse controls.
Character Choose Control -> Left Click
Camera Control -> Right Click
Move Control -> Left Click
It is easier for me this way, you can try this settings too.
Athens is like a marketplace full of player stalls. Thus much more laggy than other cities. However, you can buy most of the materials and equipment there. Player crafted items are usually of better quality.
To build level 2 ships, sail to Genoa. (West wing of Italy)
To build level 3 or 4 ships, sail to Algiers (Capital City of Algeria, north Africa)
Having a real atlas of the world really helps in this game.