Go to cgtextures.com those are all royalty free, and they have some great textures you can modify for what your looking for. You may also want to look at a cheap program like crazy bump which can help build normal maps etc… thats the quick dirty way and you can acheive realistic just messing with roughness and metalic and lighting. Lighting is the biggest way to acheive what your looking for, you can only do so much to the textures.