Wiring a ceiling fan
Your bedroom outlets have been wired to the receptacles in the traditional "switched outlet" configuration. On your receptacles there are brass bridge tabs creating the circuit between the two receptacle plugs, the electrician has removed this bridge and wired the top receptacle to a "hot" wire and the bottom to the "switched hot" from the light switch. The bottom of the light switch should have a constant "hot" wire on it. You will need to purchased a single gang two switch light switch and replace the existing single gang light switch with the dual. Jumper the existing incoming hot wire to the two new switches. One switch will continue to switch your outlets and the new switch will control the fan. You will need to run a wire to the ceiling fixture to power the fan if no current wiring exists. Use a licensed electrician if you are not capable of performing these changes.