WOW! Sounds fantastic. Hope you get both the funding and practical support to make this happen.
Sorry I have no specific practical experience to offer you. However, having organised several large scale community projects over the years and been on numerous community funding porject courses etc etc, my advice to you is to follow the "ABCD" Project management rules:
A - Activate. Finds ways to get people Actively involved, not just talking about it but actually agreeing to specific action. I imagine this is particularly important if involving a long term commitment involving various schools. This can take a lot of balls to get people who say "oh yes I will help" to getting them to commit to X amount of money or X hours a month etc etc
B - Believe - without self belief and enthusing others to believe in it totally, any project will fail. There will be darker days when it all feels too much and it is preparing yourself for those moments when others will need you to rally everyone around, trouble shoot sticky issues and get all back on track.
C - Communicate - talk, talk and talk some more. Then listen, listen, think about what people say and listen some more! Collect advice from as many wide ranging sources as possible, from listening and talking with the children themselves, to insurance experts, vets, local farmers, charities, media, other project runners - keep lines of communications and various methods of communicating (websites, forums, meetings, noticeboards in communitites, newsletters etc etc) all running.
D- most important one: Delegate. Don?t try to do it all. Allow others to help. Many people find this incredibly hard, especially if the project is their "baby". Having that trust in place to be able to encourage others to take areas of responsibility can be critically important.
All of that is probably rather obvious stuff but some of it took me several projects and a few harsh lessons to learn and appreciate the ABCD code for myself. Hope it helps a little! Good luck