How does lifetime access sound? After enrolling, you have unlimited access to the course for as long as you like - across any and all devices you own. Plus, this course won't always be offered at this price, as new strategies and information will continually be added. You won't have to pay a penny for any updates, though. Once you purchase, you will receive all updates for free.
In the first email I first send them the link to the lead magnet a second time (the excuse to email them) and ask them if they saw the offer (affiliate link). I then go on and give a bullet point list of why I think they should get it as well as maybe 1 testimonial to give it credibility and start easing into the emotional realm. I'll usually finish with a question, opening a loop making them want to open the next email.
Affiliate marketing is also called "performance marketing", in reference to how sales employees are typically being compensated. Such employees are typically paid a commission for each sale they close, and sometimes are paid performance incentives for exceeding objectives. Affiliates are not employed by the advertiser whose products or services they promote, but the compensation models applied to affiliate marketing are very similar to the ones used for people in the advertisers' internal sales department.