You can create a free account on WordPress.com to become familiar with the WordPress dashboard. But when you actually begin designing and building your actual website, you will want to buy domain/hosting and use WordPress.org. Otherwise you will need to do some migrating: https://www.wpbeginner.com/wp-tutorials/how-to-properly-move-your-blog-from-wordpress-com-to-wordpress-org/
Affiliate Marketplaces – ShareASale and ClickBank have thousands of merchants to choose from. It’s nice to login to 1 place and check the performance of multiple affiliates without going to each individual portal on each website. Many programs aren’t part of a marketplace though. I’m a big fan of ShareASale – there are so many companies and industries you can choose from.
Then once you’ve got your domain name and hosting sorted out, it’s time to pick a CMS, or Content Management System, that will let you update pages, build your blog and integrate with all the other services you need. It’s hard to go wrong with WordPress—the CMS powering close to a quarter of the internet. Keep in mind that eventually as you start growing traffic to your blog, you'll be wise to invest in a managed WordPress hosting plan from a company with great service like Kinsta, where all of the settings are custom-tailored and optimized to work particularly well with WordPress-powered websites.