Angela, that answer can come from a broad spectrum of beliefs, traditions, and preferences.
What it comes down to is that a wand is merely a tool. It is symbolic and used for directing energy. Many people choose to use a wand, many choose to use a ritual knife for the same purpose, and many will simply point. Some people will use a staff or sword for the same purposes. Again, this can depend on tradition, preference, and it can even be dependent upon rank in an organized group.
But more directly to your question: most people who ise a wand will dedicate it to the purpose. That is, if they use a pencil, then that pencil becomes their wand. They do not use it for any ither purpose. Some may use a ceremony for dedication, while some just decide and use the tool for no other purpose.