At least sketch out a draft of what you are thinking on a bar napkin or scratch pad and fax it to us so that we can give you an estimate of the time necessary to make your image ready for screenprinting. Most art jobs require one to four hours. Complex separations can cost hundreds of dollars but are worth it if the artwork has a lot of shading. If you have a design already then it may need to be modified for screenprinting. Line art is solid black or color areas similar to block type.
Halftones are shaded or gray tones generally found in photographs.
The type of art you have will dictate what needs to be done to it to prepare it for screenprinting. The basic idea is that each color will be transferred one at a time to the garment and therefore needs to be photographically duplicated to the screen that will allow a printer to put the ink on the shirt. The colors in a design, details in the artwork, budget and the original image control this process. The more complex the design, the more preparation is generally needed. Screeprinting is not a direct duplication process and the final product is always a rendition of the original translated through very basic printing techniques.