Affiliate marketing is often touted as a "get rich quick scheme" by shady sites offering pyramid schemes that promise quick cash for little effort. Make no mistake—successful affiliate marketers like Pat Flynn of Smart Passive Income put in a lot of effort toward building an audience and creating quality content that will bring in sustainable passive income. Expect to do a lot of legwork up front—but if you play your cards right, you can build a solid source of revenue over time.
Banners – after testing them out I decided to take down my banner ads since they looked salesy and weren’t working like my affiliate links did. They’re easy to throw up, but distracting and probably won’t get great results. If you try them, be sure to show specific sidebar banners based on the type of content people are reading on your blog (for posts that fall under my SEO category I would show a banner related to SEO, and for posts under my website speed category I would show a different banner). You can do this using a plugin like Widget Logic.
Build relationships. Affiliate marketing takes a lot of work and patience before any real money is made. Affiliate marketing programs drive traffic to the affiliate marketer's website, but the marketer is responsible for building lasting professional relationships with the affiliate partners out of that web traffic. The marketer must also continually seek out better partnerships with other affiliates.[24]

It can be published as a book, and other people have already suggested what to include into ‘part 2’. As someone who has been asked by other people wanting to promote my products/serviced, I’d love to read about the merchant’s side of AM, e.g. various software that can be used, how to choose affiliate partners, what to include in the agreement, etc.
Most businesses require startup fees as well as a cash flow to finance the products being sold. However, affiliate marketing can be done at a low cost, meaning you can get started quickly and without much hassle. There are no affiliate program fees to worry about and no need to create a product. Beginning this line of work is relatively straightforward.
Regarding “convincing someone to buy your product is not that easy”, I do agree with you, but at the same time, I remember all those products I’ve bought online. I did not search on Google for those products neither I went to the company websites to get information and buy. They were affiliate people and their blogs that inspired to buy them. PrettyLink Pro, SEO Pressor was recommended by Kimberley, I bought Profits Theme, WP Zon builder because Alex Whaley recommended. Similarly I bought CommentLuv Premium because Ileane, Kavita, Steve and many others were talking good about it.
I personally prefer to do it that way--you can create a more convincing review that's more likely to make sales. It's not always possible or practical, though; for example, would you break up with your significant other just to test a product for getting your ex back? ;-) In cases like that, or if the product is expensive, it's usually best just to use the vendor's affiliate resources instead.
The topic you choose must have enough depth that you can create a lot of content for it. This is important for building an authoritative site, for search engine optimization, and most importantly, for the end user. If you don't have enough content about a topic, you're not going to be taken very seriously as an authority on the topic and it's unlikely you can convince someone to make a purchase from you. 
It will probably take a couple years to build a sustainable, passive income. That is the 1st car I have EVER purchased myself at age 29 (I was broke until then and leased from my parents). But the time committed to affiliate marketing and creating great tutorials and YouTube videos was worth it… I work for myself, there is virtually no limit on how much I can make, my schedule is flexible, and I collect enough passive income to live how I want.

Education occurs most often in "real life" by becoming involved and learning the details as time progresses. Although there are several books on the topic, some so-called "how-to" or "silver bullet" books instruct readers to manipulate holes in the Google algorithm, which can quickly become out of date,[36] or suggest strategies no longer endorsed or permitted by advertisers.[37]

SEO: getting consistent traffic by writing AWESOME content about your keywords (there’s a phrase “length is strength” in SEO and this paid off big time for me). Maybe you’re doing videos or an eCourse, but I found blog posts WAY easier to update which means less maintenance. The biggest factor by FAR was the time I spent meticulously creating my tutorials… which eventually resulted in a sudden 3x increase in SEO traffic
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