There are many different scenarios of how to establish order but the most efficient way is through a simple democracy. A direct democracy where no in particular is in charge. Everyone has a say or opinion. Putting things up to a vote as a group makes things fair in a way having an individual leader making the decisions wouldn’t. There would be no fights for leadership or too much indecision on any one topic. Voting, expression, and communication through a small simplified version of direct democracy for survival purposes would be most efficient. Plus it would make for a good foundation of trust and teamwork. It is however possible for someone to rise up amongst the rest and lead properly. Its possible but it’d present more cons than pros in the long run.
Hope this helps!