Develop NSIS Installer for Windows application

We have developed a simple application and require a "installshield" to be developed for it. We prefer that the open source NSIS install package be used. The installation procedure should do the following: 1. Confirm the file path 2. Get and validate the license key (we will provide license key validator utility) 3. Install the application directory and its contents 4. Install the Windows service 5. Allow the user to specify whether the Windows service should be started at boot-up by default 6. Show a README file