Getting error in Macbook Air

please let me know how can i create the folders in macbook to segregate the photos

need to know also i have the apple pan drive but can not transfer data from iPhone to pan drive and also form mac book to pan drive

it is very complicated for me to use this please help

the same way when i insert my external hard drive to the mac book i can not play th songs or videos and also can not open the files which is really important to my office work

please do the needful

and if i have to download any App for above issues please let me know

Thanks in advance.