A standard PC usually have two fans. One on the Processor [the one on you board]and one on top of you're Keyboard and mouse plug ins.

>>where are the other fans and those two other things?<<

I suppose you reffering to the CPU (Central Processing Unit) and the Heatsink when you say "two other things" . That you can locate at the bottom of you're fan, the CPU fan. Its the silver metal 'block' when removing the fan and the 'silver metal block' (Heatsink) you'll see the CPU? processor witch is a greenish sqaure. apply some grease on the square without removing it it fit everything neatly back into their place.

NOTE:If you're not comfortable with pc's then Ill highly reccomend that you take you're PC to the local techy.
Cheers