I personally believe it depend on the person regarding the herbs. Personally I experimented with a lot of different teas and incence in order to find what suited me.
I would reccomend chamomile, mugwortor or valeriana for tea, citrus, ditany crete and rosemary for incence.
I would may benefit from calcite and amethyst. Moreover some people believe calsite could be benefitial.
However I would suggest that if you are a begginer you shouldn't experiment with incense, herbs or stones of any kind. You should first practice your meditation and visualisation without any help.
I suggest that due to:
The fact that you may actually need them to achieve any level of meditation.
The fact it may actually block you from experiencing any level of meditation if you are a begginer and you have yet to experience meditation or any kind of out of body experience.
In case you are a bigginner I would reccomend you to practice your meditation and visualisation before you attempt astral projection.