The only answer which will cover the scope of your question is research. White sage is a good example, as I know several different uses off hand. It can be bundled and dried for a smudge ritual (burning/smouldering). Or the leaves (fresh or dried) can be used in a bath, or a tea. Branches are spread on the floor of some sacred spaces (such as in a sweat lodge, or even someone's private ritual space with inspiration for similar reasons), or used to ritually buffet (strike or beat, not food related) one's body. Some people will crumble the leaves as part of a floor sweep -- for spiritual or not spiritual purposes. That still leaves poultices, packs, pillows, sachets, mojo bags, amulets, and so much more, all with white sage.
Basically, I suggest an internet search (if you don't have a good reference book handy, or even if you do as you may find additional info) for " [herb name] ritual use," and see what you find. Then decide what your purpose is, and which use would best fit your needs.