Drafting of a professional services engagement contract

We require a legal document drafted which can be used to outline the terms which an individual or company are engaged for the provision of services. Our company is located within Australia but we enage with providers all over the world. Some of the items which the document are to cover are: * Schedule of rates for charges * Invoicing and cost management * Reporting * Travel policies * Scope of services provided * Standard provisions - Compliance with local laws, compliance with instructions, confidentiality, non compete, dispute resolution, intellectual property * Special provisions - area where special requirements can be added on a case by case basis * Limitations of engagement - Authority, Subcontracting, work with competitors, etc.