Build program support with others who will help you make this happen. You may want to recruit honorary co-chairs. These are well-known public figures who help legitimize the program. Recruit adult club advisors. Recruit a well-respected teacher or agency representative who can invite other adults to an informational meeting.
Science teachers are often interested.
Write an Earth Service Corps program description. Develop a marketing plan. This is important for recruitment, publicity, and fundraising. Develop a yearly calendar of program activities. Use your community advisory council and initial student leaders to sketch this out.