Creating a new Nerdio for Azure (NFA) account is a fairly straightforward process. Enter the customer's name, select Azure region, and connect to Office 365 & Azure. One important item to consider is that the Azure account must have an empty subscription. If it doesn't, you will have to create a new subscription.
If you are a direct CSP, use Microsoft Partner Center to create the subscription. If you are an indirect CSP, you must use your distributor's portal. Everyone else can simply login to Azure portal, search for Subscriptions service and click Add to create a new one.