How to make your own herbal hair oil?

Right now, I am in trouble with my hairs, I have started oil treatments but it is not going very well. Now I want to make my own herbal oil. I have collected a few herbs including Indian goose berry (amla), gotu kola, merigold and bhringraj. But I am not sure how to make hair oil out of them. Do I have to boil them in some base oil or something else. Does any one have any idea? Your suggestions will be highly appreciated. Thanks