There is a standard advertised per hour price based on the chosen VM size and Azure region. You will be charged for this on a per minute basis.
I would suggest using the Azure pricing calculator to take a look at the standard prices for the various VM sizes and regions - https://azure.microsoft.com/en-us/pricing/calculator/
Azure cost management can then be used in the Azure portal to track your current spend, i.e. what your overall monthly cost is depending on what you have deployed and how much you have used. https://video2.skills-academy.com/en-us/azure/cost-management-billing/costs/quick-acm-cost-analysis