Drawing and surfing simple polygons in x y theta

Hi, I'm trying to learn how to draw, surf, and video simple polygon shapes raised into x, y, theta in preparation for a project I'm working on. Can anyone help me get started with this? I have watched a number of tutorials for working in Matlab but am not experienced and currently don't have anyone to 'show me the ropes' in terms of getting started in this specific area. I understand what I want but not how to get there using Matlab so any advice/examples would be TREMENDOUSLY helpful! Thank you.