Start at Wolves they spawn around 1:45 and then head to Blue buff at 1:55 if you haven't finished wolves go blue anyway. because you would have gone wolves anyway if you were to go blue first. After Wolves go to Wraiths and then depending on your smite cooldown either go to golems and then red buff or Red buff and then golems...

Its easy to look for ganks, if an enemy is overextended past the river its obvious. If no one is overextending you can try to sneak a gank by going behind your lane and going into the back bush and then forwarding on to the front bush without the enemy minons or champions seeing you