Go to:
http://www.theiia.org. That's the website for the Institutue of Internal Auditors. You will find a sample charter there. I also saw an offering on BOL regarding auditing deposit accounts that looked like the administrative topics (sample size, etc.) could be employed in many types of audits.
Are you only looking at consumer compliance or all compliance, e.g. FMLA, OSHA, Visa? Knowing that should help us respond.