The first thing that you need to think is how to promote your site after it's online. It is the hard part for every site owner because they need to attract visitor day by day. And if they can do this for at least three months, then they can add some advertising like Google Adsense or something like that so the site will give some profit for you. Affiliates can work if you can find a good product that many people were looking for and you can use any affiliate website to choose the product.

It is difficult to say how much you can earn because it depends on how many visitors that come to your site and click the ads in that site. But I know that one website that has thousand visitors can give a nice profit at the end of the month so you can make passive income especially if you do not stop to promote your site.