The requirement of legal notice is only under the civil law. First thing you need to understand is you need to hire an advocate to send a legal notice to someone. Also, you can only send a legal notice if someone breaches the law and regulations or any condition of the contract between you and other person. You must consider your point first, for which you have decided to send a legal notice. It must be genuine. After considering all above mentioned things, if you think the case is genuine then find the specific cause for which you are going to send the notice. After writing the legal notice, get it signed by you and your advocate. Send it to the registered address of the person/company to which you are sending the notice.