In general, a will must be signed in the presence of two witnesses, each of whom must also sign your will.
Whether or not a notarized will is accepted by the court depends on the rules of the state in which you live. You should cross-reference the rules of your state and comply to them, or simply consult an estate planning attorney for the best approach.
How is a Will Implemented After my Death?
Do I Need Professional Help to Prepare a Will?
What is Probate?