Well. First you need to have had some experience in making websites. Then you need adobe flash CS3/4 to make the animation. Then you need a website that will host your website (Go Daddy, Brave host etc.) Then you will need to create your website. I personally suggest Dream-weaver CS3/4 or Freewebs.com (pay money every month though). You will also need a domain name which you can search if it's taken at Go Daddy.com. You will also need help from others because it will take you forever to make it on your own. Then you can add what ever else you want: Music, avatars (use Microsoft Creator for the avatars and animations if Flash is to complicated), Catalogs, Places etc.
And now you know all the basics of creating a website like Club Penguin or Pandanda.
And now you know all the basics of creating a website like Club Penguin or Pandanda.