What you are after is a non-poaching and non-solicitation agreement. There are many considerations such as whether the parties are genuinely in business, whether the document is to be structured as a deed of covenant, the intended geographical area, the duration of the restrictions etc. Restraint of trade provisions are subject to a range of enforceability requirements.
Without looking at these issues carefully from a legal perspective you could end up with a document that is not legally enforceable. It may well still act as a useful deterrent to the other party but if push>comes>to>shove>comes>to>dispute the restrictions could be considered null and void when tested in arbitration or in a court of law.
