You will indeed need a USB Ant+ dongle and I would be inclined to get a USB extension cable as well
https://www.amazon.co.uk/s/ref=nb_sb_noss_1?url=search-alias=computers&field-keywords=usb+extension+cables to get the dongle as close to the transmitting point of the trainer as possible, this is often cited as a reason why both Wahoo trainers can be subject to power dropping out etc, I have the Kickr Snap btw. Currently I run Zwift using my iPad, but I used a laptop beforehand. Mine isn't a high powered machine by any means Pentium N3700 1.60 GHz processor with 8GB of RAM and on-board Intel HD Graphics. Runs it just fine providing I get the dongle as close the leg of the Snap as possible. In truth I could do with a slightly longer one. All you need to get the view on the TV is an HDMI cable to connect laptop to TV. It's worth noting that the Kickr and Snap are very prone to interference, so I wouldn't recommend having anything Bluetooth in the vicinity when the trainer is transmitting Ant+, they will conflict and the trainer may malfunction either with power fluctuations or power spikes. That said, touch wood I have had little issue since switching to using the iPad when Zwift came on IOS. Graphically it is not as advanced, but is still more than adequate. Hope this helps.