Do they have experience with your size and type of business?
Will they be accessible and return your calls promptly?
Can they provide insights into other areas, such as human resources or operations?
Are they respected in the community?
Do you trust and feel comfortable with them?
Do they represent themselves in a professional manner?
review the statements you've generated yourself to find any problems or questionable items
perform an annual audit of your books to ensure everything is being maintained accurately