Please follow the current recommendations of ERC and other professional societies - some materials available on internet can be out-of-date.
Basic approach to emergent situations
Second step - React: basic approach to unconscious patient
Emergency call: Where are you calling from? (sorry, in czech only, but with plenty of pictures)
CPR - ERC guidelines (pages 99 - 102)
How NOT TO DO IT! (do not learn first aid from soccer players 😉)