I’m not RAFAC permanent staff but I’ve managed fellow volunteers in this and in other organisations.
To be honest I don’t think there’s really a great deal of difference to properly managing paid employees.
Treat your people like people. Be credible in your own role. Listen to the people working at the lower levels - they’ve got a handle on what is actually happening versus what you think is or should be happening.
About the only difference is that with volunteers they might not be able to “turn up for work” one day or other.