Yes it can be a bit confronting, but basically if you want to use MC, you do not need MinimServer.
Functionally at a high level for what you need they do the same thing, but MC is specialised software so is much more mature, supported, reliable and fully formed. MinimServer will act as a media server, but is fairly rudimentary.
Essentially to act as a file server, the NAS just needs to store the files and make them available to MC to import into its library.
Then MC will act as the Media Server and broker (make those files available as multimedia content) to your DAC. So your setup will be, NAS as file server (the actual files are stored here), and MC as Media Server - it communicates with your DAC.
To link the 2, you need to import files from the file server into your Media Server Library. The files themselves are not imported, but their metadata is used to create a library on MC. MC will still point to the NAS for the actual file content.
So install MC on your Laptop - sound like you've done this - access the actual file structure on the NAS, and use the import function in MC to populate your library.