The State Bar of California has a "fill-in-the-blank" Will form if you would like to create your own Will today.
You can complete the form following the instructions, sign it in the presence of two witnesses and have your witnesses sign the Will where indicated. The State Bar also has a FAQ for the "fill-in-the-blank" Will form.
The most important thing to note is that you cannot cross out, add or change any portion of this Will to suit your wishes if you do not like some of the language. All you can do is fill in the spaces provided if you want the Will be to valid. Think of it like Mad Libs. But instead of putting down funny or dirty words, put down your wishes.
Having a Will is better than not having a Will.