The confidentiality agreement is in many ways the equivalent of a non_disclosure agreement in that it is intended to protect the company from the loss of any confidential information or intellectual property. While the two agreements may be similar in nature, you will find that the major difference between the two are the penalties should an employee breach the contract and divulge any confidential information. The more serious penalties are reserved for a confidentiality agreement and can result in criminal lawsuits and very large fines if not prison sentences.
What exactly should be in this type of contract? Well, firstly you need to be aware of any laws in your country regarding employing people. It is likely these laws will override your agreement so it makes sense to line them up so they match. Then you need to put the basics in there. This might include hours of work, what their role is and how much they are going to be paid. After this, it is a matter of adding some other clauses to protect both you and the employee. This could be to do with dismissal and other situations that might arise.