Usual is to boot up, insert the recovery cd and restart. Look for the prompt at bottom of screen to "press any key to boot from cd" and hit the spacebar when this appears. You will have to check out your bios settings to see if the cd drive is set to boot before the hdd, or the pc will just start up normally regardless.
Sometimes there is a second disc that contains all the drivers etc., but not always. Have a look at the documentation that came with your pc to check what there should be. Maybe its all on one disc.