You always shake the bag of runes first, you then hold the bag still for one minute, after which you place your hand inside and draw a rune. Learn the meaning of the rune to begin with, then focus on the inscription, your third eye will activate, this way you find you're able to see more then first meets the eye.
Practice by reading one rune at a time, then you can graduate to a runic spread, the simplest is pulling three runes from a bag, placing them left to right, this being past present and future.
If you purchase the Ralph Blum Viking runes, a book comes with them, giving you several layouts, from very simple to more complex spreads.
I started working with the Viking runes when I was quite young, I did not have a tutor for this, I practiced each day until I became proficient.
I divine for myself and others, Psychometry has always been my favourite method of divination.