No matter if you're building an app for the iPhone or Android, a Google Action, or an Amazon Alexa Skill, there are guidelines that you need to follow to make sure your app is approved by the review team. Mark and Allen go over some of the rules that you should read before you start to develop your #VoiceFirst skill.
Check out the guidelines for Alexa: https://developer.amazon.com/en-US/docs/alexa/custom-skills/policy-testing-for-an-alexa-skill.html