What file format and resolution is preferred?

Any of the common file formats are acceptable but if you use a format that loses too much quality for print due to compression we may have to reject it until you can submit a better quality file, either through raised dpi, different file type, or both. You should be using a minimum 300 dpi for the specified size of your artwork. Also please specify whether the art should be Matte or Glossy when you are submitting.