Planning for an influencer campaign involves several key elements for an effective brief:

1. Campaign Goals: What do you hope to achieve with this campaign? Goals could be increasing brand awareness, driving traffic, increasing sales, or growing a social media following.

2. Target Audience: Detailed information about who you’re aiming to reach, their demographics, interests, and behaviours.

3. Campaign Message: What is the message you’re conveying? Keep it consistent and align it with your brand values.

4. Influencer Guidelines: Offer specific instructions about what the influencer should include or avoid in their content. Reiterate what the FTC guidelines are.

5. Product & Brand Information: Provide information about the product or service being promoted, and also some background information about the brand.

6. Timeline: The start and end dates, important milestones, and desired frequency of posts.

7. Budget: Outline a budget that includes the payment for the influencers and any production costs.

8. Key Performance Indicators (KPIs): Indicators that will help to measure the success of your campaign. This could include impressions, click-through rates, engagement rates, or sales.

For influencer discovery, campaign planning, and performance tracking, platforms like Flinque can be incredibly useful. Flinque offers features that can simplify these processes, like robust search functions, audience analytics, and reporting tools. Remember, the choice of platform depends on your specific team needs and workflows.