In modern zombie movies, other people are always portrayed as the main threat. Focusing on surviving against other people in an apocalyptic scenario (societal breakdown, pandemic, natural disaster) is far more important than surviving against zombies.

Therefore what you plan and play out in your mind to prepare against this childish notion of a "zombie apocalypse" should be more or less applicable to real life scenarios as long as you put more weight on the human threat aspect.

Playing along with your game, specifically for Malaysia, definitely the ones with the guns and more prone to violence (samseng, polis, etc) will take care of themselves first. Gangs will be formed, stealing property from others, stockpiling all the looted food, medication, and kicking out everyone else not in their interest.

The less aggressive common folk will band together into submissive groups begging for scraps from the superior gangs, trading themselves as labour or sexual slaves in exchange for food and shelter. Some wannabe hero groups may form to fight this "injustice" but most probably will taken out or absorbed into the gangs once given a taste of the "riches".