This is easy, only a couple of ways. The longer way take Lockwood valley road west to the 33 north to the 166 west and you will hit the 101 at Santa Maria, then south on the 101. Or when you hit the 33 so south and hit the 101 in Ventura then north up the 101. For a nicer, backroads ride, go south on the 33 from Lockwood, then west on the 150 just south of Ojai. Before you get back to the 101 at Carpentria, take a right at the "Y" and follow this road all the way to santabarbra. Its not one solid road, its a series of different backroads so you will have to make several turns at stopsigns. Just follow the signs, its highway (or state route) 198 or something. Mostly right turns as you head west.
edit: this is all highway, not sure if you want dirt.