Wow that’s a lot of very different kinds of topics you plan on covering, Rolland! My advice would be to pare it down to just 2-3 closely related topics that you can start to build an audience around… and from there, focus on just a small handful of activities that’ll help you attract some viewers/readers (rather than spending time on a lot of different tactics).
If you already have a website or blog, look for vendors that offer related but noncompeting products and see if they have an affiliate program. Stick to familiar products and brands—they're easier to sell. For promotion, place simple text or graphics-based ads in appropriate places on your site; you can review or recommend products or create a dedicated sales page or website to promote a particular product.
It’s sometimes hard to comprehend just how much people love t-shirts. And with the right niche, marketing and tools, you can create an online t-shirt business that makes you extra money online while you sleep. (Even Bloomberg and Forbes feature stories from entrepreneurs who've done just that.) Services like TeeSpring make it easier than ever to create a t-shirt drop-shipping business where they handle the sales, printing, and shipping, and you’re only responsible for design and marketing. Or you can even buy into well-established franchise businesses like Rhea Lana that sell fashionable, affordable kids clothing and get the backing of a proven organization to fuel your online sales. For more tips, check out this simple guide to launching and marketing an online clothing store by my friends over at Selz.
You know those top-down cooking or craft videos you just can’t seem to get away from these days? There are people out there making a living from them. 78% of B2C companies depend on user-generated content, like those videos, for their marketing campaigns. You can sign up as a creator on a site like Darby Smart and potentially work with brands like Nordstrom, Mattel, and BarkBox. Or, learn how to master PPC advertising and you can use the content to build your YouTube following and monetize through ads and views.
Find your niche partners, collaborators, and champions: As you’re creating your course, look for notable people who are also creating content in the space. Look at how their businesses operate and incorporate that into your own plan. You can also reach out to any influencers and make them affiliates for your own course. This way, they’ll be incentivized to share your content with their own audiences (which can be a major way to generate your first sales—it helps if you're using one of the best CRMs for small business—and start building your own community!)
The best part? You get to put a smile on someone’s face — and you get paid to do it. Though exact wages will vary, Instacart Shoppers can earn as much as $20 per hour. If you committed to a typical 40-hour workweek, your compensation would come in at just under $40,000 per year (without taking into consideration expenses like gas and wear and tear on your vehicle).

The music industry might not be as strong as it was in the 80s, but there are still plenty of ways to make money online as a musician. Sites like SoundBetter let you sell your services as a songwriter, producer, or session musician to thousands of customers a month. While Musicbed, Music Vine, Marmoset, and SongFreedom are perfect for licensing your music to TV shows, movies, and web series.

People are always looking to have their cars washed and detailed. You could be a mobile car washer and detailer without having a permanent location. Reach out to people you know or make some flyers and put it in your neighbors' mailboxes. If you want to get serious about it, prop up a one-page website or give out business cards. You can make money quickly doing this.
Etsy: While Etsy's popularity has declined recently, it's still a great resource for selling handmade items online. No need for complex ecommerce sites or merchant accounts or any sort of automation. The company takes a commission of every sale and charges a small listing fee per item. But many still use Etsy as their primary source of income. The best part is that you can also sell digital products such as poster designs. 
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