Why did you change the ambient colour in the world settings ? Changing it to a very light colour without reducing the ambient shading in the material will make everything too bright.
In the properties panel under Display you have enabled ‘Only Render’. Turn this off so you can adjust the non renderable objects such as lights.
For basic lighting, adjust the lights so they illuminate the object how you want.
Your blend file does not contain any textures (use File / External Data menu to pack textures into blend file)