Not a dumb question. When I am mounting orchids it is usually to a tree branch. I lay down a thin layer of sphagnum moss and hold it with a couple three turns of fishing line. Then the orchid goes on top with another thin layer of moss on top of that. And then wrap all with more fishing line being careful not to bind on the plant itself. On larger pieces of wood/cork I have used florists tape, though I don't care for it, too weak, and even plain old plastic twist ties. I'm sure you'll get many more methods on here.
