Here's something I've been wanting to write up for a while but haven't had much chance to do so. I'll be covering three different money-making programs with their advantages and disadvantages.
*Well, four...but two of the companies are owned by the same group.
First off, you'll need some sort of tax id (SSN works if you're a US resident), a mailing address, and a website of some sort. Then, you'll need the next set of things: time, and content.
First up- Adsense!
It's Google's powerhouse for advertising on search and on other websites. It's good for just about anything, as long as your content is considered "safe for work". The minimum threshold for cashing out is $100USD (rates are different for other currencies), and when your account hits that amount for that month, it'll be processed and sent before the end of the next month. That can be seen as a disadvantage for people that might be looking for a quick payout.
Adsense has a good amount of customization for ads to be displayed on your site, from various sizing options, to color customization to match your site desgin.
This one is a bit different in the way it serves ads: in-line ads, or commercial-style (intermission) ads. It allows safe for work content and non worksafe content. You'll have to setup your links as Adult or Clean when you do make the links so you can generate better money for relevant content. This ad system requires PayPal, and has a minimum payout of $5.00, so this can be seen as the quick-and-dirty way of trying to make some quick money. Be careful though, intermission ads can get on people's nerves really quick, so unless you have something like an established gallery or the like, it may not be the best idea to do.
Finally- Adbrite and Black Label Ads
I call this the "Adsense Alternative", the interface is different, but the concept is pretty much the same. Adbrite is the "safe for work" component, whereas Black Label Ads is the adult component of the ad network. Accounts between the two are shared, but your ad campaigns are not. You have the option of setting your minimum payout, to as low as $5.00. At the end of the month, your earnings go into a waiting period for two months to "mature" and then your payment is processed and you'll usually get the check by the middle of that month it's been processed. This is the longest of the three, so you will *really* need some patience for that first check.
I currently use all three on different websites, and earlier in the month, I finally received my first check from Black Label Ads for $14.25. For my Linkbucks account, I've withdrawn a total of $45 so far. Adsense on the otherhand...I just hit the half-way point for the payout, so it's taking a _long_ time. Hope someone found this informative~