Creating a 'Setup Application' Process

Hi,

First post here, so be gentle!

I am creating a service ticket application just to learn the ins & outs of ASP.NET Core, and I am thinking about how I would go about creating a set up process for when a user installs the system on their servers for the first time. 

For those of you who have used systems like Jenkins, OpenProject and the like, when you first install it they have a setup process for creating an admin account, database connection settings etc. all configurable by the user. This process only runs ones and doesn't appear again after the user has done it (i.e. the 'setup process' :) ).

How could I do such a thing with ASP.NET Core? Creating the forms etc. isn't the problem for me, just how would Isafely save these settings the user enters and how to check (and load) that I only run the process once? 

Thanks,

Nick