There are a number of runic symbols that could be used as methods of protection. However, remember that runes are associated with the Nordic religions and those religions do not contain such concepts as "demons" or "hellhounds" so whether they will be the best choice is doubtful. I'll note that demons and hellhounds are not part of Wiccan beliefs either.
Rather than use runes to protect against beings drawn from the Abrahamic religions, I would suggest you looking into the Seals of Solomon. You can find images for them at http://www.empireamulets.com/the-44-king-solomon-seals.html
And if you're looking into protecting an area of forest I would not carve the symbols into a tree. Doing that damages the bark and may cause the tree to become diseased or invaded by harmful insects. Try painting them on a stone and then burying the stone beneate a tree or along the edges of the area you wish to protect.
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