The first thing you will need to do to make smores is get your supplies. Hershey's is always a safe bet for chocolate. Any graham crackers available will do, and of course some standard large marshmallows.
Once you've got your provisions, you need to build a campfire. Be sure the fire is safely contained in a ring of stones. Open flame is not ideal for roasting marshmallows because it tends to ignite the them. Let the wood burn down to coals and keep the marshmallow on the outside portion of fire.
Use a small pocket knife to sharpen a stick for your marshmallow. Look for a clean, hard branch to avoid pieces of the stick getting inside the marshmallow.
A favorite technique if mine is to leave the chocolate on rock close to the fire while I roast my marshmallow.
Brown the marshmallow and avoid catching it on fire, or worse, dropping it in the dirt.
Drop the marshmallow on top of the chocolate and admire your work before topping off the sandwich and enjoying the fruits of your labor.