whenever i mirror my object it doesn't follow my 3D cursor and isn't working?
Mirror works based off the objects origin not the 3D cursor.
If you're just starting Blender, there's a Blender Basics course which is better to get the hang of things. Press Start is not very basic, it has some intermediate thing. Linking you up:
https://cgcookie.com/courses/blender-basics-an-introduction-to-blender-4-x