runes are the ancient language of words before letters, so each letter is in essence a power word or invocation of a spirit, you use them in ritual or spell work for meaning and symbology. many druids have a set of ruines hand made (when making your own divination or symbolic tools you transfer your own life energy into your tool so it has more attunement with your body and your energies) and use these runes in everything from divination (looking into the spiritual workings of life - influences and bad energies) aswell as in healing rituals to represent specific healing energies called into effect to bind them there till the task is done, they can also be used in sigils (a written or drawn representation of a hope, wish, thought, or spell) your energies charge the sigil as you draw it, and then you let go of it (never think of it again) while burning the sigil. use your own understandings to define your use of them.
There`s also this reeeeeeealy awsome website created by a Runemaster that will teach you everything there is to know about the runes. The site is sunnyway.com/runes. There are a lot of great runecharms there along with instructions on diferent ways to use them and lots of great Norse mythology and stories!