sign up for azure, get free credits and use it to build / architect something. A webapp fronted by a load balancer connected to a cache, a database, an object store should be good enough to get started. Do it by hand first, understand what is needed and then use a infra as code(IaC) tool like terraform to build/deploy it. Save on cost by destroying when not working on it. IaC will make spinning up and tearing down much faster