It doesn't matter how cheap or expensive a talisman is, it's the intent (energy) that empowers the item.
Hold the talisman in your palms of your hands, close your eyes, and imagine/see/sense/feel/know the talisman creating a protective barrier around you made of the strongest metal you can think of. I like to use adamantium (from X-Men) as my protective barrier. Continue to hold and focus on the talisman until you feel your intent is in it. Carry or wear it at all times.
I don't know what religion you practice, but find a prayer, chant, or incantation you connect with most.
Good luck, honey.