How to make an Annotated Bibliography? 

I need assistance in formulating an annotated bibliography for my research thesis on innovative practices introduced by e-commerce websites in the last decade. My supervisor has asked me to send one in and I’ve never made one, so I’m clueless how to go about it. Has anyone made an annotated bibliography for a management related dissertation or thesis? Could you tell me how to go about selecting the headings for the various columns of the annotated bibliography? And how do I decide how many references to include in the table?