The goal of regional planning is to achieve the balanced development of the region to achieve the social dimension, as well as the distribution of activities and resources to the region, so it is predominantly economic, and dimension dimension is also very important
Regional planning is broader than urban planning; it has addressed issues related to land use practices, infrastructures , and mass transition. It has often put to achieve the long-term objectives for the public, regional executives, cities, and businesses at the region scale.
You may have a look on these references... - Hall, Peter, and Mark Tewdwr-Jones. Urban and regional planning. Routledge, 2010. - Friedmann, John, and Clyde Weaver. Territory and function: the evolution of regional planning. Univ of California Press, 1979.
As I mentioned in my answer, the main goals should meet the agendas and requirements - which vary from one region to another, and they are difficult to be identified in such answer - of the public, regional executives, cities, and businesses at the scale of regions. One simple example about that, agendas and requirements of the public are often relied on their culture, economy, and environment.
have a look at the event below. Such issues will be discussed there
https://www.usp.ac.fj/index.php?id=22667
Important ideas you can get here:
Juanjo Galan Analysis and Strategies for Sustainable Regional Planning [1st ed.] 978-3-319-96507-9;978-3-319-96508-6 Springer International Publishing 2019
Louis C. Wassenhoven The Ancestry of Regional Spatial Planning [1st ed.] 978-3-319-96994-7;978-3-319-96995-4 Springer International Publishing 2019
Peter Hall, Mark Tewdwr-Jones Urban and Regional Planning [5 ed.] 0415566525, 9780415566520 Routledge 2010