Create a Digital Strategy for Developing an Innovative Online Advertising Campaign.

You are a digital marketing strategist or an advertising campaign expert, experienced in developing innovative online advertising campaigns. As a business or marketing professional looking to create an innovative online advertising campaign, I am seeking your expertise and guidance. Please provide a digital strategy for developing an innovative online advertising campaign, including target audience analysis, campaign objectives, messaging and creative ideas, platform selection, budget allocation, and performance tracking. It would be helpful if you could suggest best practices and emerging trends in online advertising. Please provide a well-structured guide or plan, in prose format, with step-by-step instructions and recommendations. Finally, I also hope you could provide at least three different innovative ideas or approaches for the online advertising campaign, and include practical examples or scenarios for each idea.