Don't rely only on exchanging banners to get traffic to your site. Banner exchange must come in addition to your web strategy. The more you show other banners, the more your banner will be show on other sites. If you don't have any traffic to your site chances are no one will see your banner.
Banners are usually easy to install.
After you register you just paste a HTML code onto your web page and the banner exchange will post your banner on other sites. A good banner exchange program must give you access to these basic statistics. Site impressions - How many banners you shown on your site. Banner display - How many times your banner has been shown on other sites. The number of times someone has clicked on your banner and visited your page.