Your first step is
identifying who/where you will target for volunteer recruitment. You
don't have the time or the resources to try and recruit everyone who
cares about your issue or candidate, and you have to know where to
start.
In addition to paying
attention to potential volunteers' issues, interests, and values, you
should have learned two other things about them: their capacity and
their commitment.
Now that you've identified potential
volunteers, gotten to know them, and figured out a variety of roles for
them to play, you're all ready to get hard commitments from folks.