Important factors for the kids are:

— Physical activity in a communicative context: doing exercises, repeating actions, dancing, playing games with motion.

— For a teacher — speaking English slower, distinctively, repeating phrases many times, motivating students to repeat.

— A lot of supplementary materials to touch: cards, toys, balls, cubes, modelling clay, etc.

— Interactivity: presentations, on-line games, video is obligatory, printed text-books are needed.

— Songs, games, cartoons — you may repeat them from time to time.

— Reading through the system of phonixes, not giving IPA (transcription): https://www.starfall.com/h/ltr-classic/

— Samples of speaking models provided, speaking through games and activities.