First, it is a good rule of thumb to get permission before casting spells for another. If not, you are forcing your will onto the other and can have negative effects for you.
An easy good luck charm to make for him/her:
Small square green cotton cloth (6x6 inch will work)
Combination (in multiples of three) of: Raw almond, allspice, barley, basil, chamomile, cinnamon, whole clove, lavender, nutmeg, dried orange peel, rice.
Place herbs in the center of the cloth and gather the corners together. Tie the ribbon around the top keeping the contents inside. Have him/her carry that good luck charm around with them.