Go to File...Page Set Up. Under the margins tab you can adjust how big a margin you want at the top, bottom, left and right of your page. Under the paper tab you can check that you have the right paper and orientation selected. Under the layout tab you can adjust how far you want the header and footer to be from the edge of the page. Remember to have 'apply to whole document selected'. Just paly around wuth these settings until you get a print preview that looks correct.