I have extensive experience planning and running multi million dollar social media advertising campaigns for clients such as Apple, Amazon and Spotify. With over ten years digital experience - the last three of which solely in paid social media advertising - I can help you understand how the professionals do it. My previous position was as lead account manager at Glow, a Facebook sPMD and Twitter MPP. I am currently Global Head of Paid Social for the Net a Porter Yoox group.
Nobody else has mentioned that Facebook are extremely restrictive of affiliate links. You will likely not be able to run a traffic driving campaign if you plan on directing straight to your affiliate URL. You will need to incorporate an offer or sales page between the two which adds a barrier to entry but also allows for some more advanced remarketing strategy etc.