Always disclose your affiliations. Your readers will appreciate your honesty and will feel better about contributing to your earnings. If they sense that you are being less than honest about your affiliations, they are savvy enough to bypass your link and go directly to the vendor just to avoid giving you referral credit (even though the price is the same it's just something people do; strange but true!).
When it comes to traffic for sales or leads it varies from industry to industry and country to country, on the top of that it requires other complex process that are suitable only for the advanced paid traffic masters. In this article I will be discussing traffic for branding and improving rank on several web metrics which are responsible for judging the quality of a website such as Alexa rank, Similarweb Rank, Domain Rating, WOT Rank and so on.