I dont know squat about plant lore so I wouldn't be able to source the herbs naturally, assuming the right herbs even grow where I live. Is it okay if I get them from a store.
The best way is to go to a herbal store. Employees of such stores are trained and knowledgeable in this field (this is the case at least in my country). Do not go to stores that sell herbs of unknown origin, as they can harm your health.