Those are solid ideas for a spell. You could adapt a spell like this Uncrossing spell , for example while you are burning the incense, send your intention (thoughts, energy) their way. 
You can write a few words or improvise something to direct the energy from the spell to go to them to help with whatever they need help with.
Another way to cast a protection spell on someone would be to create a protection talisman or charge a stone with your intention, and give it to your friend.