What do I need to start Streaming Music thru my Audio System

Ask your cat he looks smart.

Get a BlueSound Node 2i or even a second hand or refurbished Node 2.

How much you looking to spend, do you have an ethernet port close or is this going to be wifi? You could hook your laptop to your Wadia DAC by USB and try some free internet radio stations to get an idea but it will be low resolution files. If you decide to buy into a subscription service like Quboz or Tidal it's  easier to use a dedicated streamer like the Node2i mentioned above but a tablet or smartphone is the preferred way to control though a laptop can be used.

You have good kit , fully able to do justice to hi-res files, so what you need is a good "streamer", i.e. a device that can connect to internet services such as TIdal, Qobuz, etc, or bridge with Roon (which is a user-firendly software that brings together all the digital content you have, like a "source").There are many such streamers around, the best costing upwards of 6k. As djones mentioned  above, you would need to budget it, but any audiophile streamer will sound better than your laptop.