Facebook Group page graphics to include: Logo, Banner, Product approval logo

Information for the business: Professional association
Industry: Healthcare
Design details: We need all graphics for our Facebook group created, to include:

-Main image/banner with a single high resolution stock photo (not provided) and details of the organisation
-Association logo
- Association product approval logo (logo above with APPROVED underneath will do)
-Needs to be optimised for handheld electronic devices (ensure images are cut off when looking on a mobile).

Would prefer a clean, professional, modern look, effectively using whitespace.
We have secured all trademarks and the domain for redirect to the Facebook group.
Target audience: Healthcare Professionals interested in membership
Ideas for the visual style: https://www.facebook.com/dentalhealthorg/
Things to avoid: Overly busy
Preferred colors: Blue, Green, Silver/Grey White and natural wood tones
Urls to draw inspiration from: https://www.facebook.com/dentalhealthorg/
Where the design will be used: Facebook
Extra notes: