When designing your banners, try to keep them between 5K to 10K in size. The faster your banner loads, the more likely it is to be seen. Also, use animated banners when you can. They are more effective than static banners. Use the ALT attribute in the image tags of your banners.
Many people surf the web with images turned off.
Only requirement is a link to their site using the code they provide. Visit them and check out some samples. Nearly 100 various demonstrations. Banners will be done in 2-3 days. Offering FREE banners for businesses related web sites.