What are you referring to? The STEEM wallet? Or the site itself? You'll need a linux system, over 8 GB of RAM, a stable net connection, An apache or nginx web server and a custom WP plugin that I wrote for withdrawals through woocommerce of SBD.. If you were referring to the site.
The STEEM wallet setup method can be found here: https://steem.io/documentation/how-to-build/