You need a niche blog to start off with, if you are reading this then the chances are you have already got a blog with a bit of content on it, possibly even a Google PR. Even if you haven't you can set on up in the space of a few minutes and stick a few posts on it whilst you follow the steps that I am going to give you.
The first thing you do is go to a few affiliate directories and find yourself a suitable affiliate partner that compliments you blog www.clickbank.com or www.paydotcom.com are good sources to start looking in. It won't take long to get the ad on your blog in a prime position and then you can take the next step.
You can't just rely on people buying this product or service without giving it a bit of exposure beyond just having the ad there. So the next step is to write good review about the product or service that you are advertising - Try to create a good buzz in the review. If you are not up to doing this well or feel that you might want a third party to do the review visit www.elance.com. For a small fee you can get a really good review, it is essential that you get the best you can for maximum buzz.
The next thing to do is post the review on your blog and spread the word. You won't get lots of traffic by doing nothing. You need to take that post and submit to as many social and media sites as you can find. Good starting places are Digg.com and Propeller.com. If you do a search for similar sites and submit to them you are on the road to big traffic. The more you submit the more traffic you will generate.
Don't stop there, get in touch with friends and other social based communities and get networking. Article directories such as www.goarticles.com and www.ezinearticles.com are worth subscribing to along with others similar directories. Most will accept reviews and will put it under the noses of more web publishers. This means even more traffic. If you leave your link back in these article directories you will get even more traffic feeding into your blog.
If you follow these steps, you have a good opportunity to make money quickly with no scam in sight! It is just a little grafting and common sense. Affiliate work is a goldmine if you know how to tackle it.