Setting up a flour mill on agricultural land is possible, but the process depends on the scale. A domestic-scale mill may be permitted by the local Gram Panchayat without land use change. However, for a commercial-scale operation, you'll likely need to convert the land to non-agricultural use and obtain sanctions from the Town Planning Department. It's advisable to consult local authorities, such as the District Industries Centre or village office, for specific guidance and necessary certificates.