Bleed is 0.125", and slug is 0. Leave a 2" margin for the top and bottom and 1" left and right.
Important text should remain within the margins, and the bleeds, which are the background colours and images, should be extended to the bleed border outside the trim edge.
If you plan on moving it around a bit, we would recommend choosing the economical retractable banner, as the premium is a little heavier and more for long term setup.