since no one actually gave you any real advice, i guess i'll give you a starting point. today many "private" sites earn their money off of things such as ads and affiliate marketing (along with selling their own products).
here's an easy to read guide on affiliate marketing:
http://www.nickycakes.com/newbie-guide/ it will take you through the basics on what it is, and how it's done.
for example - say you have a site with book reviews... amazon has a program that allows you to sell their books from your own site using their links. you get a certain percentage off of each sale. so if you are reviewing a book such as romeo and juliet, you can place a link somewhere on that page that will take the user to the purchasing page at amazon. if the person decides to buy the book from there, you will get some money from it. ebay has a similar program where you can link to ebay sales.
you can also sell ad space on your website to other providers. if you have a large following, you can start contacting companies (related to your site's content) to offer them ad space on your page. they'll probably ask you for statistics on what your site brings in daily in terms of unique hits, etc. this also ties in to affiliate marketing where the more visitors you have, the higher the chances of you selling something.
you can also sell services to others. for example: "how i got rich" videos/books. i'm sure you've seen a ton of these mumbo jumbo infomercials on tv. people do this on the web too.
there are also pay per click ads where if someone clicks on the ad such as those by adsense, you'll get some money for it. keep in mind that these companies have ways of detecting if the owner of the site is committing fraud, so they can and will suspend your account from getting paid.
there's also the akai berry (and similar bs stuff) where people can go to a site, sign up, and buy into an initial portion of the product, and then get re-billed monthly until they cancel, so you'll be earning money each time they buy a new batch of whatever you're selling. for this you'd need a stand-alone site.
you can also set up a twitter or facebook page and direct people from there to your site (ex: just posted a review for romeo and juliet. go see what i have to say about it on my website).
there are hundreds of ways of earning money off the web, but all require work. you can't simply put up a site and sit back and wait for the money to start rolling in. you have to work on it where it eventually starts working to your favor, at which point you will continue improving and expanding until you'll be able to earn more. keep in mind that this should be considered as passive income (or as something "on the side") instead of primary until you can safely and constantly earn a good amount that would allow you to pay bills and put away some for savings. who knows, maybe after that you'll get another idea, and put up a second money-making website to make even more money.
another important thing is search engine optimization and promotion across the web. you have to do things to get your site at top of search engine results for certain things (ex: a person goes to google and wants to find romeo and juliet reviews. if you've put in a lot of work, you might (seeing and r&j book would be too popular, and this would be saturated by other sites, it could be difficult) end up on first two pages of google results, and you'd get lots of visitors).
there are also "legal" and "illegal" (referred to as blackhat) ways of getting your site at the top of the search results. "legal" is usually done over time, and your site doesn't run the risk of getting removed from search engines, while the "illegal" way can generate a lot of visitors quickly, it can land your page in a "sandbox" which will eventually prevent it from coming up on search results.
there are tons of sites out there that can give you suggestions on how to make money online, and how to properly advertise it ("legally" and "illegally"). most usually contain a lot of useless info, so you'll have to do some reading to determine what's good, and what isn't. here are some sites you should search for to get more info: sitepoint, digitalpoint, wickedfire, warriorforum, blackhatworld
in the end, don't overdo it. you don't want to have a site looking like one big ad if its main purpose is to provide people with information. otherwise it will wind up like another version of aol where a person is greeted with tons of spam popups.