Here's a quick guide to create a macOS Sierra 10.12 Public Beta Installation USB using Clover. Please note, this guide is not universal, and may not work for all systems.
STEP 1: Download macOS Sierra Public Beta
1. Enroll in the Free Apple Beta Software Program
2. Open Mac App Store
3. Log in with your Apple ID
4. Redeem code
4. Download...
How to Create a macOS Sierra Public Beta Installation USB