I need a new campaign designing (double sided postcard)

Information for the business: We want to promote volunteering
Design details: Community Impact Bucks are a charity that supports other charities and one of our major focuses this year is attracting more people into volunteering. As part of this we have built a new website, which we want to use as the primary tool for interacting with potential volunteers.

SO, we need a brand identify that can be used across: Postcards, banners, advertising etc. I see this as being a lead image with a clear brand and call to action, which can be re-sized for different formats. We are a charity so unfortunately are unable to create a new design for each piece.

We want to make volunteering seem exciting, aspirational and life-enhancing. I've attached an example of the style I'd like to see.
Target audience: 18-34, experience-seekers
Content on the front/back side and body: See extra notes
Ideas for the visual style: See NT Tourism & photos provided
Things to avoid: we want to shed our corporate, slightly cheesy image!
Extra notes: Copy:

Side A:

'Your Life. Your Community. Your Experience
Discover volunteeringbucks.org.uk
Where will volunteering take you?'

Community Impact Bucks Logo & Volunteering Bucks Logo

Side B‘
Be the change you wish to see in the world’ –Mahatma Ghandi
When was the last time you did something remarkable?
Life is short. Do stuff that matters’
Join the tribe:
volunteeringbucks.org.uk