There are different kinds of amulets. There are runic, zodiac, birth, natural charms. You also need to decide for what purpose you are creating an amulet. You can even make a birch, stone and even paper. But you can not use a synthetic material. Also you should charge it properly.
Once you've loaded an amulet, try to carry it with you. And if you leave it, then wrap in red or black cloth and place in a secluded place. It is impossible to give the amulet into the wrong hands, or its power runs out.