In terms of actually isolating your pecs as a muscle theres only a limited amount of movements you can do,its more about the kind of mind/muscle connection you can get and really concentrating on working your pecs rather than your shoulders and triceps......i dont know what level of lifter you are so it might not apply but i always liked to get a good understanding of what a particular muscle actually did,where it comes from,what its job is,the direction of the fibres and their insertion into the tendons etc.....the pec minor actually sits underneath the pec major,you cant see it and you cant