If no one in the organization is up to date on modern practices, I would look into some courses offered by AIAG. I took a five day course to get my lead auditor certification. It's not as thorough as decent OJT, but it will get your foot into the door and get you up to speed on the basics of auditing. This course supplemented with some OJT with our quality manager was enough to get me familiar with IATF standards. Of course, you will learn a lot over time.