I am a amateur to Blender but I want to make a model for my sims game. However, I want to know how I can make faces smooth? As in not have them look blockish / crinkly... if that makes sense. I need a smooth interior and exterior (excluding the shelves). I tried subdivsion surface but that just makes the mesh look all doughy... anyways, thanks in advance!
Right click to access to Object Context Menu and Shade Smooth (or header menu > Object > Shade Smooth). You can change the angle threshold of smoothness in the Properties panel > Object Data > Normals > Auto Smooth. But the whole shape will still look angulous on its borders, if you need to round it for real you need to give it a Subdivision Surface modifier (and apply it if you want to import into a game engine).