Пост в Santiago de los Caballeros, Santiago Province, Dominican Republic

What is the jest way to go to Las Galleras? I heard about Linea junior buses going to Samanta but dont know where they have bus stop in Santiago (if you know write where is it and which concho goes there). Maybe you also know departure hours? Or is it better to go by guagua to San Francisco (if so tell me location of. guaguas stop please)?

Thanks in advance