Depends on your beliefs as to what kind of charms may help. I wear or carry black stones: obsidian, jet, etc, to collect negative energy. Then I cleanse the stones and use it again. It can be a piece of jewelry. Being an empath, I put up protection field around me when I go places. In my home, I smudge mostly with sage, then put up protection in the form of quartz crystals on my window sills and by doors. Personal protection, I wear rings all the time, and add pentacle/triquetra pendant necklace(s) when I go anywhere. These are all cleansed and charged before hand, of course. These are just suggestions for you.
How much do you know about such things? Grounding, shielding, energies, and even auras can help you with decisions on what will work for you. If you are new to magick, the forums will be great help. Forums tab, then click General Info, then Starting Out and Basics Expanded might be of help.These are good reads, even if all don't apply to your path.
Hope this helps.