For those who want to join an expedition, rather than plan their own, the RGS-IBG

• produces a directory of expedition organisations entitled Joining an Expedition  detailing organisations which regularly arrange expeditions, ranging from environmental research and conservation work to community projects and adventurous training. 
• publishes a bulletin of expedition vacancies
• maintains of register of people available for expeditions
• can advise on fund-raising to join an expedition
• put you in touch with other organisations recruiting expedition members
• help you improve your skills and qualifications to lead an expedition