You can advertise offline or online. When advertising offline, using flyers as an example, first
take your referral url to tinyurl.com for a short free redirect.
Mouse over the blue shaded area at the top right of the page that says 'Affiliates' and there you
can click on your 'Banners' and your 'Splash Pages'. You can use them in free traffic exchanges.
If you have a blog or website you could advertise them on that too.
There is lots of places to advertise online, you can do a google search.