Graduate Teaching Assistants (GTAs) are often the first college instructors who new students meet when they arrive for their first day of class, and as instructors and as students, GTAs are the future of the discipline. As such, GTAs need to receive comprehensive training in a variety of pedagogical, procedural, and professional areas to help graduate students continue to develop as instructors and, eventually, into full-time faculty. To assist basic course directors, department chairs, and faculty in creating and supporting a comprehensive and ongoing GTA training program, this article provides 10 best practices for training new GTAs who will be teaching introductory communication courses.