You might be interested in some threads from FAQ on both the goals of the Pearl Harbor attack in specific and the larger goals that the Japanese high command hoped to achieve in the aftermath of a successful war:

• Was the attack on Pearl Harbour a gamble by the Japanese Empire, or did they truly believed such a attack would cripple the US to the point of not winning the war? - 73 comments, over 9 months old.
• The first top level answer gives a good overview of Japanese strategy in the opening stages of the war and it spawns a large amount of discussion and analysis of Japanese strategy in the immediate pre-war and beyond that you might find interesting.
• What did the Japanese expect the reaction to Pearl Harbor to be? - 5 comments, over 1 year old.
• This commenters thread uses the Japanese view on the pre-war tensions to explore why the Pearl Harbor attacks were a logical extension of the Empire's goals and attitudes.
• What was Japan's plan for all the territories it acquired if they won the war? - 4 comments, over 10 months old.
• This is a synopsis of the colonial situation in the immediate pre-war and the plans for expansion in the event of a successful war.