Find a profitable niche. Starting with your interests, write down as many niche ideas as you can. Think about topics people might search online. Ideas include passions (like surfing or body building), fears (like spiders or speaking in front of crowds) and problems (like getting out of debt). Do keyword research to see it others are interested in the topic. Find out if a domain name is available that matches the keyword 100 percent. 
Learn then selling guidelines. Each marketplace has guidelines that define what you can and cannot sell. State and federal laws also impact what items are prohibited. In general, you cannot sell alcohol, weapons, service contracts, animals or event tickets. Also, while not always prohibited, you may find restrictions on how you can sell items in some categories, such as art, gift cards and coupons. eBay, Craigslist and Amazon publish these guidelines on their websites.
A relative newcomer that was only founded in 2014, ConvertKit has taken the world of email marketing by storm. According to the company, they now have nearly 20,000 active customers of their email services. Their affiliate program works by paying existing customers a lifetime 30 percent commission for referrals that subsequently become ConvertKit customers or who sign up for ConvertKit webinars and other digital products.
Building trust with your audience is paramount in affiliate marketing, and the quickest way to lose trust is to recommend products either you haven’t used before or that aren’t a good fit for your audience. Also make sure you never tell anyone to directly buy a product, you are simply recommending the product. The more helpful you are and the more you make quality recommendations, the more likely your web visitors will come back for your expertise.
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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: