1. Start research for species, habitat and find suitable location.
2. Purchase, rent or lease at least 30 hectare of land.
3. Start building some shelters/stables/fenced areas for injured, sick animals and for breeding program. And build/rent/purchase a house and living space for the people working for this project.
4. Get/purchase some endangered species from zoo's or private owners for this new breeding program. After a while or after generations of successful surviving of the species, the last generation will be prepared to set free in the habitat where it should be living.