i use infusions for both. i learned how to do infusions the way herbalist do them, so my way may differ.
i use what is called the simplers method. which means i use a mason or other glass jar and fill it up 1/4, 1/2, 3/4, or full up with herb material depending on what herb i am using. then fill it again with oil. let set for a minimum of six weeks but again it depends on the herb how long.