i if want to start small project (site)
how much i need for basic one ? OR complex one ?
A faucet for example could cost you more then +1000$ because If you are serious about it, you should hire designers, make it unique compared to others (competitive rates etc.) and mostly, protect it from bots and multi accounts (a Captcha is not enough), this is the only way to insure that both you and your users will make profit. A gambling site (which I don't recommend even If it was easy to start) will clearly cost much more, development, security etc. are top priority otherwise you will get hacked in no time but most of the funds should be for paying users.
Well i guess if the OP is computer literate then he could reduce some amounts. Because it would be really hard to make those if you don't have enough I.T. knowledge for this matter. And probably a team of 3 if possible. Cause you would need someone to at least to test your site. As Omega said, security is very needed and you also have to advertise the services you are trying to offer and it is not easy to advertise because you could have many competitors and it takes years for that to be sustainable.