I need an A3 poster designed

Information for the business: We are a charity fundraising team
Design details: I need an A3 sweepstake poster designed for our London Marathon running team, so that they can take down guesses from sponsors about their predicted finishing time. The poster will need to show our charity name, logo and the event name, and each potential finishing time for the race (e.g. 4h11m, 4h12m, 4h13m...) with a space alongside each time so that people can write their name next to their guess for a donation and chance to win a prize.
Content on the front/back side and body: Title, event name, logo, timings
Ideas for the visual style: Simple, brand colours, possibly factoring in an image of our work
Preferred colors: Orange, white, blue, green
Extra notes: Green PANTONE® 368
Blue PANTONE® 300
Orange PANTONE® 151