Install all the dependencies:
npm install
Create a link to build artifacts if no link exists yet:
cd src
ln -s ../build/contracts contracts
Deploy contracts/migrations:
truffle migrate --reset
You might need to setup Ganache to use the same port (default is 8545) as defined in truffle.js.
Run Ganache either with the app or cli:
ganache-cli
Start the React app in development mode:
npm start
View the app at http://localhost:3000/