Whether you are just out of college, a parent working at home or a management employee, volunteer work is important and valid in your career development. Nothing in the rule book says that when you list work experience on your resume that you had to be paid monetarily for it.
Work experience is work experience whether paid or non paid.
You will find some of life's most rewarding experiences in your volunteer career. It is important to take your volunteer work seriously. This is a job that can make a difference in this world and only you can make it a successful experience. Find something that enhances your skills in your own career as well as helping others at the same time. If you want bookkeeping skills then volunteer to be a treasurer on a board of directors.