First you collect 5 scorecards from any rated courses. Make sure you can play sufficiently well to pass the courtesy rd. Be familar with basic rules and know how to count scores.
Join a club. Ssg and mgk are examples. You may also join clubs like sentosa or lower budget like nsrcc. Book for courtesy rd and pass the written test and the 9 holes. Safety and etiquette as important as skills if not more.
Maintaining is easy. Just submit scores and they will update you each mth
We are what we repeatedly do. Excellence then, is not an act, but a habit.