so can u give the detail information on how to earn money with my own web site?

Question

because i want earn lot of money with my own web site.
2)how can i get money by advertising others classifieds in different web sites
3) who will give me the money
4)is it legal
5) because i don't want to cheat the people and earn money

i am very much eagar to learn all the details which i have asked above. As soon as i got information i will launch my own web site. pls help me (no gimmicks please)