Before installing the web client you need a Sales & Marketing server running with a database.
To install the CRM Server, read more here
Make sure the system requirements are met on the web server.
Install the Sales & Marketing web client
Upgrade from an earlier version of CRM.web
You may expose the Web Services to be used by Customer Service or Pocket.
Before a user may log in to the Sales & Marketing web client, they need to be assigned login rights. This is done in the Admin client