All you need to do is run the commands here in OSX terminal - the links are for reference.
Install these with the following few commands:
- Homebrew, a command-line tool for installing apps on OSX
- virtualbox, a free VM runner on OSX
- vagrant, a command line VM runner for virtualbox
This will allow you to spin up a VM with a single command - you wont need to install virtualbox & vagrant again if you need another VM.