Set your document size to equal the trim size of your finished pieces and add 1/8 inch of bleed (.125 inches) beyond the trim on all sides. A bleed is extra area outside of your document that is trimmed off to insure proper cuts. In simple terms- your background should go off an 8th of an inch more than your actual print size. Bleed is not required unless it is specified under the product description.
We recommend you leave 1/4″ (.25″) from all surrounding edges of your printed piece. If you leave less than 1/4″ (.25″), we cannot be held responsible for unequal borders from top to bottom and from side to side. This is due to the final cutting process in which some “draw” or “slippage” occurs in the cutting process. This is a print industry standard.
Also, please keep your text at least 1/4″ away from the edge of the piece unless it is an eighth page or smaller. This way your text is in a “safe” area.
Preferred DPI for all image files is 300 DPI. You cannot increase your resolution for a design that has been created low resolution. The only solution to this is to redesign your piece at the correct resolution.