Set things up so that students can get to work right away. Explain the rules. Students must know about work hours, safety, and confidentiality. Give clear direction. Students will most likely be unfamiliar with your work and your work environment.
Offer work that is professional and directly related to the student's major.
Give them responsibility. Let students have the authority to complete the task. Put the work into perspective. Let students know how their work fits into the overall project and goal. Make students part of the team.