Wot did you use to design the site, At most times, you can rely on the good ol' google bot to pick up keywords from html coding, you can allow google to advertise on your page as well, google has a range of services you can use to advertise your company, like adsense etc.
About.com has a section where they advertise companies as well, you can use twitter and facebook etc or any other social media app youre comfortable with.
