Contact your national accreditation body (e.g., ANAB in the US, UKAS in the UK, JAS-ANZ in Australia). You will need to purchase a copy of the which explains the accreditation application of 17029.
ISO/IEC 17029 provides the high-level principles for bodies performing both activities. iso iec 17029 pdf
Many websites that offer "free ISO PDFs" are phishing sites designed to inject malware into your corporate network. Contact your national accreditation body (e