How would you design and promote an advertising campaign?

give me a product/service detailed information, segment your customers and some information about the industry and competition will also help before answering your question. 

Each advertising campaign is a project on its own and the design and promotion is specific to what you will promote. It cannot be generalized and would help if you could be more specific. 

But basically you need to define your objectives, to research and benchmark your product, its main competitors, your customer profile, your market segment, your target market, your timing and your evaluation process.