AffiNetwork will help you in creating the banner, you need some web space to use it on, and so you will need to buy ad space on websites. Contacting blog and website owners and negotiating with them individually can be stressful and time consuming, so most people choose an advertising network to help them distribute their ads.Some of these advertising networks are: Google Adwords, iab., Aol Advertising, Right Media, BuyAds.com, OpenX. Each of these has certain standards, so you should make sure that your banners comply with their regulations, before you start creating the ads.
Banner advertising can be a real deal for your business!!