It depends what you are making your wand for. -For example, if you was making a wand for love spells ONLY, you might want to use a branch from a tree associated with love, such as holly.
If you would like a all-purpose wand, the same goes- use a good wood that has pretty much all-purpose magickal properties.
However, your wand doesnt have to be made out of wood; your wand can be made out of metal! You can order or buy metal rods from a lot of places, some even have crystals attached! (For a all-purpose wand, I recommend a clear or white quartz crystal.) But not all have to have a crystal.
On the other hand, you dont need a wand! You have your own built in wand - the index finger!