You will need to install Node.js, and run "npm install" in both the client and server directories. Once that is done, you can run the client build like this:
cd client
npm start
and
cd server
npm start
At this point you can access the UI from http://localhost:3000.
See the first video for an example of me deploying this to a DigitalOcean server. I haven't written up the instructions yet.