Since your pin is going directly to a seller’s site and not your blog or review, make sure that the title and description of each pin is informative and straight to the point. You can use two to three sentences and always, always, always disclose. Remember that these titles and descriptions are what help Pinterest users find you when they do a search. The better your description is, the more sales you will get.
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. 
Affiliate marketing is commonly confused with referral marketing, as both forms of marketing use third parties to drive sales to the retailer. The two forms of marketing are differentiated, however, in how they drive sales, where affiliate marketing relies purely on financial motivations, while referral marketing relies more on trust and personal relationships.[citation needed]

I have now done three courses on Affiliate Marketing and can recommend all three so if you want to check out each of these in more details here are the links to have a look at. I like them all for different reasons and its up to do which ones you choose they all cover the basics but I would say Makingsense of affiliate marketing probably is the most in-depth and comprehensive but it depends on how much you want to go into it each has different tips but essentially each course covers the basics.

Affiliates may only post affiliate links on social media feeds they operate in line with their website URL, such as Instagram, Facebook, or Twitter. Affiliate links are prohibited on some social sharing sites, such as Pinterest and Tumblr. When posting content outside of Etsy, it is the Affiliate’s responsibility to follow each site’s policies on affiliate link
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