Hi Lisa,
You have a lot of learning ahead of you. I'll give you a quick start but to make things look really good you will need to follow tutorials on UVW Mapping and UVW Unwrapping in 3ds max. And there are many on the internet, but you probably didn't know the right terms to use. In the screenshot below You can see your scene with Scene Explorer showing the list of objects in your scene and the material editor which shows materials that you can pick from the objects in the scene. What I did for a really crude quick start was to just drag the dirty leather texture on to the ottoman object and Max automatically placed it in the Base Color slot of the material that was assigned to it. It doesn't look great because the obje ts are not UV Unwrapped properly. So your first assignment is to just drag the texture objects you want on to the objects you wan them applied to. There is a little eyedropper in the Material Editor that lets you choose the material that has been assigned to any object. So go through the scene and apply the textures you have and view the results. Explore UVW mapping and UVW Unwrapping in max tutorials.
When you get stuck, post questions back and someone here will answer you. Good luck.
