It should be as easy as running yarn install, then yarn server in one terminal and yarn client in
another!
You'll need a .env file in the server/ directory with the Mongo connection string.
It's easiest to use something like pm2 to keep the process running and easily manage it:
npm i -g pm2
yarn build:client # might take a full minute or so to run
pm2 start server/server.js
pm2 save # save configuration so pm2 can restart server.js on VM reboot