You must thought of producing dry herb/leaves, essential oil and /or both. There is no open market for oil. You can find few buyers, leaves you can sell in crude drug market. Selling herb and even leaves in local market may not prove much economicl, unles u have some agrrement with some one ahving regular demand for his formulation/herbal teas. Even oil yielding basil (Ocimum basilicum) can be a better option and essential oil has good demand.