Item #8 should be changed from interior designer to interior decorator because indeed interior designers are required to have a degree and in many states are required to be licensed. Interior designers need to know building and safety codes among other things. Selecting paint colors and toss pillows is a very small part of the job. Many commercial ID’s do very little “decorating”. See IIDA or NCIDQ for more information.
You know this one already. You include links to products you are promoting as an affiliate and every time somebody buys the product, you get a commission. With a blog, you can integrate advertising with content to make it even more likely you’ll get the sale. For example, you could do a product review—which is useful content—and then include a link to buy the product under an affiliate link.
When one of your customers makes a purchase, you purchase the product from a third-party company (the drop shipper, usually a manufacturer or wholesaler) for a lower price. This process is as simple as forwarding the order from your customer, a process that can actually be completely automated. (Remember you don't have any risk here of buying inventory because the sale has already been made).
Once you determine your customer personas, it’ll be time to do research and ensure there are enough customers available to make your business a success. The type of market research you do for this depends on your business. If you’re servicing local customers, you want to ensure there are enough prospective customers physically located near your business to make it successful. If you’re an online-only business, you need to focus on where customers are spending time online versus if they live near your home.