Your first problem is because you do not have maven in your PATH.
The second problem is what I had. I had both Maven 2 and 3 on my computer and even though I removed Maven 2 links from my PATH, it was still interfering with my new Maven.
You need to remove or rename the system variable M2_HOME.
1. Right click My Computer -> Properties
2. Advanced system settings
3. Environment Variables
4. Rename or delete M2_HOME
