If you are using MS Azure for your VMs please be sure to choose the cheapest options (B Series and A0-A4 Basic Options). Many of the choices such as the D series are way beyond what we need in this class and are much more expensive to host).
Please see the following Azure pricing guide: https://azure.microsoft.com/en-us/pricing/details/virtual-machines/windows/
Also, Azure charges you for running VM’s. You can avoid costs by completely shutting down all of your VM’s when you are not using them. Please see the following link on how to ensure all of your VM’s are shut down: https://buildazure.com/2017/03/16/properly-shutdown-azure-vm-to-save-money/
Also, please see the following videos on info on how to use Azure: https://azure.microsoft.com/en-us/get-started/
If you are using VMWare here is a quick guide: http://www.wikihow.com/Use-VMware-Workstation
Hope this info helps!