This planning and implementation guide is designed to assist marketing educators and others supportive of marketing education. It begins with definitions of vocabulary of related terminology and descriptions of the four models of internships presented in the guide: full-year, rotation-type format; 1-semester, rotation-type format; full-year format starting with shadowing and moving into performing entry-level duties; and full-year or semester format for high school seniors not in cooperative education who want a two-year college or four-year university degree before beginning their marketing-related careers. A section on planning activities for a marketing internship course covers the following: performing an internship needs analysis; seeking and gaining business support; developing a proposal; securing administrator support; forming an advisory committee; and securing approval from the Texas Education Agency. The section on implementing strategies for marketing internships focuses on these areas: program/course promotion; student recruitment procedures; recommended student placement; paid or unpaid employment; class schedules/student schedules; policies and procedures; sample forms; planned and systematic job rotation; articulation agreements with postsecondary institutions; and evaluation of student outcomes. Appendixes include a copy of Lewisville Independent School District's proposal for a marketing internship course; Texas Education Agency specifications; sample policies and procedures; and sample forms. (YLB)