Add banner to right-hand of wordpress column

Hi, If you're experienced with wordpress this should be a simple task... I've got a wordpress blog, currently the right-hand-side is filled with the n ormal stuff like "RSS Feed, Pages, Categories, etc."... I'd like these pushed down & instead have a banner in that place. The banner size is 350 by 420 plus, I'll give you a URL for when someone clicks that banner. Let me know what you require: wordpress admin access, ftp? I'll need this done within 6 hours from bid acceptance, plus current blog posts to remain the same. Regards, M. Jamal