As makerspaces begin to move into school libraries and classrooms, there is a growing need for professional development to help K-12 educators answer common questions such as "what is a makerspace," "why should I bother with a makerspace," "how do I run a makerspace," and "how do I teach from a makerspace?" In part one of this two-part series, content and professional development activities are recommended to help educators answer the "what" and "why" questions. These questions typically come up first and if adequately addressed, can help motivate educators to dig deeper into the how questions that are addressed in part two of this series. This article summarizes related literature and best practices from maker leaders to ground recommended professional development activities that may be applied in workshops or in the authentic context of making.