How to decide what experience should be placed on the resume?

So I am a recent master's grad in Mechanical Engineering in Canada and I have the following non-academic experiences (not including the things like school projects and my research work): Co-op in as an engineering intern during 2019 - 2020, a current volunteer position in a museum where I use my engineering skills to help them design stuff, and some part-time works that has nothing to do with engineering. How long should my type of recent grad resume be and how should I organize my experiences when trying to apply for an engineering job?

How long should my type of recent grad resume be

One page

and how should I organize my experiences when trying to apply for an engineering job?

Chronologically.

You should list all your experiences (which should be easy for a fresher) and allocate space according to relevance and importance. Maybe you do a one liner for all your part time jobs but a full paragraph with examples for your museum work.