Another thing: Don't be afraid to say "sorry, I can't help with that right now." You do have a life separate from your volunteer time. And if you feel overwhelmed by the requests for help, speak to the person in charge. Burned out volunteers are not a good thing. Do you have friends who complain that their kids spend too much time in front of screens (TV, Computer and Phone)? Encourage them to take the kids with them and volunteer somewhere. What a great family activity, plus you're teaching your children how important it is to be a part of their community.
Don't know where to start? How do you find out if a project, group, event, etc that you are interested in needs volunteers? Call or send an e-mail, drop by with a plate of cookies and ask. It's that simple. Some organizations have gone so long with the same crew of volunteers that often times there is a feeling of resentment when "newbies" join. Don't let that discourage you, and if it continues, talk to them. Or make your own volunteer job. Do you notice that there is always trash on the roadside when you drive home? Grab a trash bag, put on a bright colored shirt or coat and pick it up. Do you like helping senior citizens, or visiting with them? I bet there is a senior home close by with someone who doesn't have family.
Volunteering and being a part of your community is important. Too many people have the "it's not my responsibility" attitude. If each of us spent 1 hour a week volunteering, a lot of great things would happen. You can gain important skills for future employment, meet people and get new friends and change things.