Affiliate marketing can be a great way to make money online, and if you're willing to put the work in, you can be very successful.
The biggest thing when starting out is to focus on learning... don't be worried if you're not making any money in the first month... it takes a while to find a comfortable groove and the most effective methods that work for you.
Our site offers a whole range of free lessons which can help you get started. There's also a whole range of other free content out there as well. I'd be weary of anyone trying to sell you a course or anything like that when you're just starting out. Pretty much everything you need to know you can learn for free.
The biggest thing though... learn by doing. Once you've looked through some good learning material... think up a niche, get a site or a blog, and just start seeing what you can come up with. If you're first program doesn't work, you can just start another one!
You may find these lessons useful. Check them out for free at:
http://www.affilorama.com/lessons
Hope that's helpful. Best of luck!!