We have just moved into a house which has old cabinets. I am thinking of refinishing them myself. My idea of refinish is

-sanding the cabinet doors
-using a polish to change the color

couple of questions

-how do know if this is a wood cabinet or just wood veneer.
-can i sand this and polish the doors/drawers?

As you can see, I am a complete newbie. Any advice would help

Thank you