Prints generally come in 3 sizes 
Small - 12" x 9" | 9" x 12"
Medium - 16" x 12" | 12" x 16"
Large - 24" x 18" | 18" x 24"
Paper types will be a photo matte. Which tend to show colors more clearly and deepens the blacks. Any Specialty Prints will me sold as a separate item in the store with high