Welcome to Apple and Apple Discussions, Newbe
There is a port on the keyboard for the mouse; look under the top edge of the keyboard. BTW, do not hot plug or unplug the mouse or keyboard on a mac- it could fry the ADB (Apple Desktop Bus)ports.
Regarding the monitor sockets- if there are ADB sockets on the monitor, there must be someplace for it to attach to the mac- perhaps in the back somewhere, perhaps with anoth3er cable which you might not have.
No stupid questions, except those you don't ask. We all had to learn it somewhere. BTW, there is a downloadable manual for your Mac on Apple's support site here:
http://docs.info.apple.com/article.html?artnum=51132