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Hello,
do you want to use Azure DevOps Server or Azure DevOps (the SaaS offering)?
1) licensing depends on the user count and how many Visual Studio Subscriptions you have:
https://azure.microsoft.com/en-us/pricing/details/devops/azure-devops-services/
5 Basic license are included for free, every additional user needs either a valid Visual Studio Subscription or a User CAL (about 5€)
2) there are plenty of tools available in azure devops to analyze your code. If the default doesn't fit your needs head over to the marketplace and search for other tools: https://marketplace.visualstudio.com/azuredevops
3) you can create custom build agents or use the built in (only with Azure DevOps (SaaS)) to build your code. If you use private agents you have more control but you need to manage it :)
https://learn.microsoft.com/de-de/azure/devops/pipelines/agents/agents?view=azure-devops&tabs=browser
Regards
Julian