1. A computer implemented method for delivering commercials from a content management apparatus to content providers, wherein all steps are performed by the computer, the computer comprising a processor, a memory device and control logic stored therein, said method comprising: presenting a plurality of advertisement campaigns to a user through a computer interface, each advertising campaign comprising a plurality of fillable video segment slots, each fillable segment slot arranged at a specific time point within said advertisement campaign, each of the plurality of advertisement campaigns including at least one non-customizable advertisement portion and at least one customizable advertisement portion; receiving a campaign selection input from the user; in response to receiving the campaign selection input, presenting the user with a first set of criteria associated with the customizable advertisement portion of the selected advertisement campaign; receiving a first criteria selection from the user; accessing a library of media segments stored in the memory device, each of the media segments comprising a portion of an advertisement, each media segment associated with metadata defining the media segment; transmitting the criteria selection to an assembly component; searching the library for media segments having metadata correlating with the criteria selection; retrieving at least one correlating media segment from the library; inserting the correlating media segment into one of the fillable media slots in the customizable advertisement portion; merging the customizable advertisement portion comprising the correlated media segment with at least a portion of the non-customizable advertisement portion, thereby forming a completed commercial; and presenting a preview of the completed commercial prior to transmitting the completed commercial to a local content provider.