Despite its older origins, email marketing is still a viable source of affiliate marketing income. Some affiliates have email lists they can use to promote the seller’s products. Others may leverage email newsletters that include hyperlinks to products, earning a commission after the consumer purchases the product. Another method is for the affiliate to cultivate email lists over time. They use their various campaigns to collect emails en masse, then send out emails regarding the products they are promoting.
The first known large-scale non-commercial spam message was sent on 18 January 1994 by an Andrews University system administrator, by cross-posting a religious message to all USENET newsgroups. In January 1994 Mark Eberra started the first email marketing company for opt in email list under the domain Insideconnect.com. He also started the Direct Email Marketing Association to help stop unwanted email and prevent spam.  
Affiliate marketing is serious business, and to be successful, you’ll need to put in a lot of hard work. There is no “magic bullet” that will solve all your problems; you’ll have to figure it out on your own. However, George Brown’s Google Sniper is one of the best affiliate marketing training courses available, and it’s a blueprint to how to make money online.
Hey. Yes you can use just one website to promote multiple affiliate programs, but I’d say that your website should focus on just one niche. So you mention, SellHealth, that would lead me to believe your site is about health and fitness. I would then advise you to stick to that niche rather than promoting unrelated products like dog leashes and fashion accessories.
The emergence and evolution of the Internet created an opportunity for different types of publishers – ranging from individuals with a Facebook account or blog, to content review sites, deal aggregators, and app developers. As people continue to invent new ways to refer traffic to merchants, new models will surface, but here is a quick list of the popular models today, summarizing the primary promotional method.
The General Data Protection Regulation (GDPR), which took effect on May 25, 2018, is a set of regulations governing the use of personal data across the EU. This is forcing some affiliates to obtain user data through opt-in consent (updated privacy policies and cookie notices), even if they are not located in the European Union. This new regulation should also remind you to follow FTC guidelines and clearly disclose that you receive affiliate commissions from your recommendations.
Unplanned content is an 'in the moment' idea, "a spontaneous, tactical reaction." (Cramer, 2014, p. 6). The content could be trending and not have the time to take the planned content route. The unplanned content is posted sporadically and is not calendar/date/time arranged (Deshpande, 2014). Issues with unplanned content revolve around legal issues and whether the message being sent out represents the business/brand accordingly. If a company sends out a Tweet or Facebook message too hurriedly, the company may unintentionally use insensitive language or messaging that could alienate some consumers. For example, celebrity chef Paula Deen was criticized after she made a social media post commenting about HIV-AIDS and South Africa; her message was deemed to be offensive by many observers. The main difference between planned and unplanned is the time to approve the content. Unplanned content must still be approved by marketing managers, but in a much more rapid manner e.g. 1–2 hours or less. Sectors may miss errors because of being hurried. When using unplanned content Brito (2013) says, "be prepared to be reactive and respond to issues when they arise." Brito (2013) writes about having a, "crisis escalation plan", because, "It will happen". The plan involves breaking down the issue into topics and classifying the issue into groups. Colour coding the potential risk "identify and flag potential risks" also helps to organise an issue. The problem can then be handled by the correct team and dissolved more effectively rather than any person at hand trying to solve the situation.
Promote services. Think of the services you use and that your readers are likely to use. For example, a parenting blogger could promote child care or tutoring services. With services, you are likely to earn repeat commissions as visitors to your blog may purchase from the service on a recurring basis. Typical commissions for service affiliate programs range from 15 percent to 30 percent. Some service affiliate programs may pay even higher commissions, depending on what the service is.