It’s important to know where your traffic is coming from and the demographics of your audience. This will allow you to customize your messaging so that you can provide the best affiliate product recommendations. You shouldn’t just focus on the vertical you’re in, but on the traffic sources and audience that’s visiting your site. Traffic sources may include organic, paid, social media, referral, display, email, or direct traffic. You can view traffic source data in Google Analytics to view things such as time on page, bounce rate, geo location, age, gender, time of day, devices (mobile vs. desktop), and more so that you can focus your effort on the highest converting traffic. This analytics data is crucial to making informed decisions, increasing your conversion rates, and making more affiliate sales. 
So you are ready to take the affiliate world by storm. The first big hurdle is to decide what you are going to pay your affiliates. Affiliates who refer sales to you get a commission once a sale (or a different conversion action) is completed. Payments can be either (a) a flat amount (in whatever currency you operate) or (b) a percentage of the total sale (exclusive of taxes and shipping). So, how do you determine what your affiliate program commission rate should be?
If you can't ship when promised, you must notify the customer of the delay and the right to cancel. For definite delays of up to 30 days, you may treat the customer's silence as agreement to the delay. For longer or indefinite delays, and second and subsequent delays, you must get the customer's consent. If you don't, you must promptly refund all the money the customer paid you without being asked.
On one hand, long and ugly affiliate tracking links are a straight giveaway to people that you want to sell them a product (and people may be uncomfortable clicking on them). Therefore, making your link shorter and "nicer" looking will it give a more professional appearance. One of my favorite plugins for making links look "pretty" is the Pretty Links WordPress plugin.
Reversal rates are generally in the low single digits; it’s standard for about 1% of transactions to be reversed. If you see offers with extremely high reversal rates, that could be a red flag. It doesn’t mean you should necessarily stay away, but it’s worth understanding why so many transactions are returned. For example, there’s something strange going on with this merchant:
Given that I am still in reading and preparation phase, I am mainly interested to overlap my niche with real life interests so I could have motivation to produce content on regular basis. Two that I am highly interested are PC parts and Fitness. I am aware they are too general subjects with lot of sites doing the same, but my idea is to produce constant review on PC parts, Laptops, Mobile devices, Accessories all in different categories, create lists like top5 or 10 under XX budget etc. Similar approach I would use if I I decide to go with Fitness path and divide content training advice, review of fat loss methods, supplementation, nutrition etc. I am aware that this will be a long journey and that it can pass few months before sales start to kick in and that’s the risk I am ready to take. My questions are:
When formulating a commission structure, the first step is to consider all stakeholders involved in the transaction. Even though affiliate marketing is entirely performance-based — and nary a nickel gets paid unless a transaction occurs — there are several different parties taking a cut of that sale. The affiliate gets a percentage. The affiliate network gets a percentage. And, your affiliate manager might take a percentage. What initially seemed as a no-risk marketing channel could be one of your most expensive.
In 2006, the most active sectors for affiliate marketing were the adult gambling, retail industries and file-sharing services.[21]:149–150 The three sectors expected to experience the greatest growth are the mobile phone, finance, and travel sectors.[21] Soon after these sectors came the entertainment (particularly gaming) and Internet-related services (particularly broadband) sectors. Also several of the affiliate solution providers expect to see increased interest from business-to-business marketers and advertisers in using affiliate marketing as part of their mix.[21]:149–150
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