How to set up development servers SQL Server
Most of these topics aren't overly difficult but there are so many that I think you would struggle starting from scratch.

Furthermore because you're coming at it from a developer workflow point of view you'll likely discover that this kind of information doesn't get talked about much. You're likely going to have to pay for a consultant to come in, help you set up the dev server with basic backups and maintenance, and otherwise create a workflow for you.


  Does anyone know of a place where I can go to learn about this stuff?


If you were determined to do it yourself you'd search YouTube for videos on SSDT or SQL Server Database Projects which is part of Visual Studio; most of what you want is covered in some way by that (unit testing, source control through TFS or similar, deployments through msbuild, and also even schema compares). Unit testing is also commonly done with a framework called tSQLt. Deployments are sometimes done with Flyway. Database backups and maintenance are usually done with Ola Hallengren scripts or Minion Backup / Reindex. 

You'd also take a look at SQL PASS which has a lot of chapters which have online training videos on each of those topics. However most of them will come up via a YouTube search.

Those are all free tools with caveats around Visual Studio of course.

For inexpensive non-tailored training Pluralsight has a video on each of these topics above and other database administration. But if you're not a DBA then you probably don't want to waste time on learning all of these, and you're still going to be stuck with creating your own workflow. There is no "developer workflow" from soup to nuts.

Red Gate does a lot of SQL Server developer software (in particular SQL Compare, SQL Source Control, and SQL Tests). You could search for their training videos for some ideas about how a workflow in these or other tools might look like. Again you can find these on YouTube, though they also publish some free downloadable books as part of their marketing.