Usually the most reliable way to get modeling jobs is by having an agent, but it can take some work to get one. Occasionally, agents will hold open casting calls, but more often, people must try to solicit agents to take them on, which means having multiple copies of several good pictures, and a copy of a resume that lists any previous modeling work. It does help to live in a major city, but there may be talent agent that books locally in smaller cities. Just bear in mind that agencies should only charge a fee if they book jobs for the model. There should be no upfront fees, and an agency attached to a modeling school that charges money is highly disreputable.