Using just the right amount and balance of text, images and animation that are often done in Flash, banner ads have been proven to be effective online advertising tools.
If you’re designing banner ads, make sure they have small file sizes no larger than 20k so they load fast. Just like any advertising imagery, banners should catch the first 10 seconds of a visitor’s fleeting attention span when getting to the page.
No need for detailed information. That can be accomplished when the visitor finds your banner ad intriguing enough to click on it. And that means making sure you put a clickable URL to link to the site you’re advertising. Lastly, put your banner ad on the page that’s most frequently visited which is your homepage.