Used-car salesmen unfortunately have some nasty stereotypes to live down, but you don’t need a tacky blazer or a fast-talking sales pitch to make money buying and reselling cars. People throw away perfectly good (or certainly good enough) cars all the time for all sorts of trivial issues. If you know a little something about servicing a car and can make one shine for a Craigslist ad, you could take advantage of massive opportunities to buy used cars and resell them for major profit.
Owning a business can be a good path to working from home. For an initial investment, franchises offer an established business with brand awareness, a business model, a territory and maybe even access to capital. There are franchise opportunities in mailing and shipping, cosmetics, travel, marketing, employment and staffing, retail and many more industries.
Service qualified leads are contacts or customers who've indicated to your service team that they're interested in becoming a paying customer. An example of an service qualified lead is a customer who tells their customer service representative that they'd like to upgrade their product subscription; at this time, the customer service representative would up-level this customer to the appropriate sales team or representative.
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.