if i want to run an adwords campaign where i am looking to target cpr instructors/ first aid centre owners/instructors what words would you guys suggest i use?

First aid instructors, first aid experts, first aid advisors can be good KW's for you to start with. Later you may modify these if you do not get what you need.

also try first responders, certified first aid instructors, emergency response instructors etc. go to DHS(dot)Gov and check out some of what they use, throw your KWs into google keyword tool and check out what it suggests etc.