Professional Facebook Flyer Design

I need a formal and professional Facebook flyer designed to advertise my service.

Key Requirements:
- Design a Facebook flyer that effectively promotes my service
- The flyer should embody a professional and formal style
- The design should be suitable for a Facebook audience

Ideal Skills:
- Graphic Design
- Facebook Advertising Knowledge
- Experience in designing formal promotional material

Please provide examples of your previous work, ideally any Facebook flyers you've designed.