Most businesses require startup fees as well as a cash flow to finance the products being sold. However, affiliate marketing can be done at a low cost, meaning you can get started quickly and without much hassle. There are no affiliate program fees to worry about and no need to create a product. Beginning this line of work is relatively straightforward.
2nd tier. If you are an affiliate for a particular program and you refer others to sign up for that affiliate program, a 2nd tier program will pay you when the affiliates you referred make sales. For example, I am an affiliate for Ultimate Bundles. If you join their affiliate program via my 2nd tier affiliate link here. I will get a small percentage of any sales you make going forward.
Good point about reviewing online courses before you promote them to protect your reputation. However, I would like to point out that the level of attention the course creator gives you (the endorser) and what they give to a random customer might be very different. There are so called marketing gurus out there who are extremely skilled at making false promises and not delivering on them. Once they have the endorsement of a few reputed marketers and some ‘lucky’ customers, they can easily get away with ripping other people off with hyped up money making guarantees. I have had a personal experience with this as a customer, but lets not mention names! The point is, when we are promoting someone, we need to do an in-depth due diligence. Only going through their course is not enough. It would be great if there was some kind of a course review site -something like tripadvisor. This is something that the industry really needs – something to make people accountable. A lot of people are losing faith in these online courses. I am staying away from promoting people unless I am very certain of their integrity.
If I have a blog that is getting 100,000 page views a month that means that I’m probably getting at least 50,000 people to the site (most blogs will do between 1.2 to 1.4 pages per session). That means I have to try and get some small percentage of those people to buy something from me if I really want to do well. If I can’t get them to buy something then (in some cases) I have ads running on the site that will make me money anyways.
Find a profitable niche. Starting with your interests, write down as many niche ideas as you can. Think about topics people might search online. Ideas include passions (like surfing or body building), fears (like spiders or speaking in front of crowds) and problems (like getting out of debt). Do keyword research to see it others are interested in the topic. Find out if a domain name is available that matches the keyword 100 percent. 
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There are many freelance options for graphic designers who are looking to make money online. Designing layouts and graphics for promotional material, corporate reports, magazines or book covers, are all tasks that businesses are looking for online freelancers to complete. Due to its flexible nature, graphic design possibilities can range from one-off projects to ongoing work with regular clients.
Look for a gravity score of 30 or more, because these products have a proven track record of selling well for a number of different affiliates. Products, especially new products, with gravity scores under 30 may work but are more risky. Gravity scores of greater than 100 mean the product’s popular. You could have competition, but don’t worry about that. The important thing is that there’s lots of demand.
Yes is the short answer. Any time you are planing on generating money, you should have a plan. No plan means no real focus. There may be some 1/1000 percent of a chance you will succeed, but I haven't met them yet. If you have already started and have generated an income, record how. Doing so will give you material for use in expanding your business faster.
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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 on here such as poster designs.