We're going to be using Azure Kubernetes Service (AKS), so the first thing you'll need is the Azure CLI. You can install it by going to https://aka.ms/installazurecliwindows.
You will also need an Azure account; if you don't have one, then you can create one here: https://azure.microsoft.com/.
At the time of writing, you can sign up for free and receive £150/$200 of credit for the first month.
Once you've signed up, visit https://portal.azure.com. Here, you can manage your Azure resources and check your balance.