Don’t put all your eggs in one basket. If you only promote one merchant’s products, you are stuck with their commissions, their landing pages, and ultimately, their conversion rates. It is important to work with many different merchants in your niche and promote a wide range of products. This affiliate marketing strategy will diversify the amount of commissions you make and create a steady stream of revenue when building an affiliate website. 
Although it differs from spyware, adware often uses the same methods and technologies. Merchants initially were uninformed about adware, what impact it had, and how it could damage their brands. Affiliate marketers became aware of the issue much more quickly, especially because they noticed that adware often overwrites tracking cookies, thus resulting in a decline of commissions. Affiliates not employing adware felt that it was stealing commission from them. Adware often has no valuable purpose and rarely provides any useful content to the user, who is typically unaware that such software is installed on his/her computer.
Out of the list you mentioned I have tried around 5-10. And the best one out of that is ShareASale. I love it. Not, just because of the relevant affiliate programs I get there, but its user interface is damm good. I still remember the old layout of ShareASale which wasn’t user-friendly. But, they have made a good update on this. On the other hand, CJ still loads slowly. Wondering when will they ever take a note on this.
For me I would choose a program with Recurring commission. You can build a real passive income. Its the best way to go! One suggestion is contact companies who sell services and ask if you can sell their service for them. Sometimes popular affiliate programs like these have just way too many people trying to sell their service. I personally went to sitecare.ca and asked them if I could sell their service and I couldn’t be happier! So find a service you believe in and go for it!
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Always disclose your affiliate relationship. Most visitors will probably understand that graphic ad will lead to your getting paid, but if you write a review or use an in-text link as a recommendation, you want your readers to know that may lead to compensation as well. This ensures you retain transparency and trust with your readers, but also, it's required by the FTC's endorsement rules.

The problem with affiliate marketing, like many other home business options, are the so-called gurus and get-rich-quick programs that suggest affiliate marketing can be done fast and with little effort. Odds are you've read claims of affiliate marketing programs that say you can make hundreds of thousands of dollars a month doing almost nothing ("Three clicks to rich!"). Or, they suggest you can set up your affiliate site, and then forget it, except to check your bank deposits.

In time I would like to branch out into multiple niches, but am unsure whether I can do this using one company name. If I am effectively emailing various lists (who have bought different niche products and are categorised into separate email lists), would it be best to use different email addresses and company names for each niche? I am unsure what to do, as I do not wish to appear to deceive anyone, but do not want to be protrayed as an expert in every area.
This is the most popular payment offered by most of the affiliate programs. Under this program, the affiliate marketers earn commissions from the merchant each time they will send a client to the merchant website, and that client makes an actual purchase. Various affiliate programs offer a specific percentage of the sale as commission while others will pay you a fixed rate for every sale.
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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