As an affiliate for Boatbookings, you will receive 20% of their revenue - effectively meaning your commission will be about 4% of any sales from your referrals. You also receive 10% of any commissions Boatbookings make on repeat customers who were your referrals. They do have a minimum charter value of 3,000 ($/€/£/etc) before commissions are earned.
Don’t set a goal to write 3 blog posts a day… set a goal to write 1 blog post a week and make that post super helpful, long, and filled with information that is so valuable you will say “yeah, people will link to that.” 90% of my traffic/affiliate income comes from just 20 tutorials, many of which are 5+ years old. But I am constantly updating them to make the content better.
They provide access to over 100 video tutorials with PDF lesson notes which cover almost all the aspects of Affiliate Marketing. If you don’t want to purchase any professional course listed above (which I would recommend, if you can afford, as there is value, accountability, some inside information, personal support, peer network and success stories to learn from) then Affilorama is a decent option to learn the basics of Affiliate Marketing.