Hunters and pre-launching

Hi to all! We will launch our product on PH soon and wanted to ask a few questions. 1. What worked explicitly in your message to the hunter? Why did he post information specifically about your product? 2. Maybe there is some list of what must be in your message for the hunter? 3. How do you choose a hunter? Do you write to all relevant ones? 4. When should I contact them - how long before launch? 5. Did you create a pre-launching landing page? How long before launching? Thank you so much for helping!