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/
Considering that you have a finite amount of time, passive income should make up a large part of your work. If you're serious about generating any semblance of income online, then passive income should be one of your sole goals and ambitions. Why? Wouldn't you prefer to do the work one time and get paid repeatedly as opposed to relying on your time to generate that income? Invest the time at the front-end so that you can reap the benefits on the back-end. This means putting in a bit of sweat equity and not getting paid today. Rather, you'll get paid somewhere down the road. And you'll continue getting paid whether you keep building that passive income stream or you stop.
Etsy is the most popular online marketplace for handmade goods and crafts. From bracelets to phone cases, rings, furniture, and more, Etsy is perfect for anyone who is creative and wants to sell their handmade creations. As long as you have the space, this can make for one of the best ways to make money online that can be started with a very limited investment. Consider these 5 steps to starting an Etsy store, from Handmadeology.
If you're serious about making money online, start a blog. Blogging is one of the easiest and most sustainable income sources. As long as the blog is setup the right way, in the right niche, with the right content targeted at the right audience, and the offer is complementary to the content, you could make a tremendous amount of passive income from a blog.