Start by navigating to the project folder and installing dependencies :

npm install

To get the most out of editing the site in a local environment, you'll need to install the Gatsby CLI globally :

npm install -g gatsby-cli

Get live updates while editing with gatsby develop and navigating to localhost:8000 in your browser :

gatsby develop

Compile the production build :

gatsby build

Documentation for setting up a development environment :
https://www.gatsbyjs.com/docs/tutorial/part-0/

There are a number of ways to deploy the site listed in the gatsby documentation. The current build is being hosted through Netlify with auto-updates from a Github repository.

After navigating the site to a custom domain, make sure to change the siteUrl in the gatsby-config.js file.

Documentation for deployment :
https://www.gatsbyjs.com/docs/deploying-and-hosting/