Save the best contact for last, after you have had a chance to practice. Call up one of your contacts, discuss your goals and qualifications, and ask if you can meet with them to talk about opportunities in their field. When you set up meetings with people, be sure to differentiate between informational interviews and potential employment interviews with contacts. If you are truly looking only for information about a particular industry or organization, do not bring your resume with you and ask about employment opportunities once you arrive. If you have made it clear over the phone that you are looking for employment, however, it is appropriate to bring a copy of your resume with you to the meeting.
Personal contact is preferable to using the phone.
If using the telephone, ask people if this is a good time to talk. It if is not, call back at the time they specify. Set up a lunch appointment with your contact to talk about goals, your resume, and any job opportunities they may be aware of, or other people they feel you should talk to. They are sometimes your most direct link to the person who has the power to hire you. Their impressions of you can matter.