Each lawyer charges a different amount based on their experience, expertise and operating costs. I think you can expect to pay anywhere between a couple hundred of dollars to a thousand or more depending on the breadth of the representation. However, a bit of warning though, a lawyer may charge a smaller amount to just review the separation agreement and explain it to you but that probably won't be enough to tell you if you are being taken advantage of. Nonetheless, search Avvo's directory for a local family law attorney and check with him or her about their costs.