Ads is also known as, advert or advertisement.You can't place ads on your site without you getting paid,yes its true,i am getting some cool cash now every month.There are many websites that offer adverts (you advertise them and they pay you!).These websites that offers ads placement,include Addynamo and Google Adsense e.t.c.Some paid through bank transfer and some through credit.You must visit them,sign up with them,and verify your email.Lets explain steps for addynamo