The iPad will not work with a mouse. You're supposed to use the touch screen. The User Interface is geared to this, so even if you have a mouse connected its usefulness will be limited.
That said, if you absolutely have to have a mouse, you'll need to jailbreak and all that entails. Head over to our Hacking forum and read all the stickies in that thread. On the website they will be highlighted blue at the top of the list. On the app there will be a tab at the top left to switch between stickies and normal posts.