Where should you give back blows for Heimlich maneuver?

I'm not an expert but i took a CPR course so i know the basic steps. First you check for a pulse and tell someone to call 911. If there is no one else there, don't call for help and go straight to the following steps- Put one hand on top of the other and do 30 chest compressions- for infants use only two fingers- then plug the victims nose and seal your mouth around the victim's mouth. Breath into their mouth as hard as you can- you should see their chest rise. Then take a deep breath and breath into them again. Continue until either a. the scene becomes unsafe b. you find signs of life c. you are too exhausted to continue d.a trained responder shows up or e. an AED is available and you are trained to use it.