New streamer, new to streaming

I don't mean to be an a$$ but why don't you have a quick lookie at the manual, download it if you don't have it.

Your Hegel will most likely need to be connected via Ethernet cable to your router permanently unless it has WIFI.

Then you will need some sort of app on your phone or tablet to control it.

+1 @lordmelton 

Most streamers have their own app, or they may direct to you to a third party app, such as m connect.  The app will then help you play your sources.  For example, with mConnect there is a place to enter your Tidal account information.  Then everything shows up there, such as your playlists, favorites, etc.  

  If you have files stored on the computer that you want to play, the app will attempt to recognize the computer as a source and will organize your files so that you can play them from the app.

  Roon is a major step up the latter in complexity.  I recommend getting the basic feel of using the streamer down first, then do a Roon trial when you are comfortable.

You can't get high resolution digital for free but qobuz offers a free trial.  use that.

+1, @mahler123

Check out Hegel support page on how to get started with streaming. Once you are familiar with basic setup, sign up for Qobuz trial. A tablet is a must for easy browsing and to experience all the features of whichever app you end up using. 
https://support.hegel.com/product-articles/network-streaming-soundformats

Radio Paradise is hi res and free. Though it is internet radio. I listen all day in the office and love it. Listener supported so make a contribution or freeload your choice.