Develop a Adware

Develop a new adware thats shows an advertisment in the default browser from time to time. The adware will make a request to a website that will return the time for the next request and the url for the advertiment. I want a backoffice too in php that will be able to enter links in the mysql database for the adware . The adware must be installed and execute in background. Adware isn't illegal as long as the user is notified it's going to install . The Adware will be use on our projects in order to gve people our software for free . The users will be notified that our softwares might launch popups . So it's not for illegal purposes we want an adware .