How do i play games off a usb ?

i do have free mcboot and before anyone tells to play off hdd right now both the cable and hdd are broke and even when the hdd worked i had terrible cutscenes and some games just stopped working including my most favorite games it was very annoying, my questions are :
-what do i have to do to the usb like is it necessary to format and what folder do i create ?
-i have a 64gb sd card will it work using a card reader ?

thanks