Try to apply green card my brother who here to visit me on visit visa and I m a us citizen how the process works?

Your brother cannot apply for a green card while here on a visitor visa based upon an immigrant visa petition you file for him. Your brother cannot seek adjustment of status to a lawful permanent resident because it will be years before a visa is available to him. The process to sponsor a sibling takes 12 or more years depending upon your brother's native country. He cannot simply wait here for a visa to be available. You can read more about family immigration at http://myattorneyusa.com/family-immigration.