Our VisGuides 2020 Workshop proposal focuses on the analysis, design, reflection, and discussion of applicable frameworks to mastering guidelines in visualization by the broader visualization community, embedded in a larger research agenda of visualization theory and practices. This workshop follows-up the ideas from the IEEE VIS 2016 and 2018 Workshop on Creation, Curation, Critique and Conditioning of Principles and Guidelines in Visualization (C4PGV) (http://c4pgv.swansea.ac.uk, https://c4pgv.dbvis.de/). The workshop wants to deliver concrete ideas and meta-guidelines about how the visualization community can contribute to the collection, storage, formulation, and dissemination of guidelines - within and beyond the visualization community. To make this possible, we aim at: Discussing work-in-progress and current activities around visualization guidelines. Collect a comprehensive list of common and less common guidelines. Based on this collection, exercise, create, and discuss a possible framework, or template, or methodology to capture guidelines. Discuss a research agenda on how to address open questions around guidelines and how on-going research - in any field of visualization - can contribute to sustainable management and discussion of guidelines.