For some reason, some people think that marketing online is different than a traditional brick and mortar business marketing offline. The truth is that marketing is marketing and what works, works. Independent of the tools you use.

Online marketing is simply direct response marketing.

If you have a traditional, offline business, you need to be looking at some of the tactics used online by marketers and apply them to your own business.

For example, many online marketers understand that they need to sell a product and then offer an "upsell" - a higher priced offer to the person that just gave them money. This tactic should be used offline as well. When someone purchases your product or service, are you offering an upsell? Are there other items or services you can bundle together and promote?

This is done very well by McDonald's - "would you like fries with that?"
If they can make money selling simple french fries for an extra few cents per order, then surely you can offer your clients something extra.

Marketing online is the same as marketing offline - just using a different form of media.