This paper outlines the development of a teacher training program on the new curriculum for preschool education, in Greece. It highlights the theoretical framework utilized and documents the main methodological tools used in the program. The significance of professional development in the 21st century is emphasized, particularly in the context of ongoing educational reforms, and how innovative learning designs can facilitate engagement, active learning, and skills development. The paper describes the development and organization of the Digital Learning Environment (DLE) that supported the training program, using a blended learning approach that combines asynchronous and synchronous digital learning activities through the Moodle Learning Management System. The DLE aligns with a digital, andragogical, and sociopedagogical approach, which is in line with current educational trends. Accordingly, examples of activities and tools are briefly presented to demonstrate how they support theoretical and practical learning. Ultimately, the paper provides valuable insights into the principles, design, methodology, and organization of the training program, which can be applied within similar educational contexts.