Assuming Office 2010 to be roughly similar to 2007, you first need your page set-up option for the landscape orientation, which should be on the Page Layout tab, Orientation. On the same tab you'll find Columns.

To open the header and footer, double-click in the margin space at the top of the page. You can paste your copied logo and address in where you like, or type the address in the footer by placing your cursor there. Align left, center, right, or otherwise just as you would type/graphics in the page area. Double-click in the page area to get out of the header/footer.

Best,
Ulo