These links below are going to give you enough information how to deploy yours EOS-4.10.2-veos.vmdk switch image within Virtualbox or any other hypervisor. All what you need is to download 2 files (the EOS.vmdk and Aboot*.iso) and follow the steps.
vEOS and VirtualBox
VMWare Fusion Virtual Networks
Building a Virtual Lab with Arista vEOS and VirtualBox
If everything works fine after you power on your Arista VM switch you should see the following window:
The most important commands at the beginning (as seen above):
admin # user name en # no pass is required bash # get out of the arista cli to linux bash
As it follows the Cisco CLI behavior you can play with it by using Tab and '?' chars to explore available options.