You need to decide which machines you want to run, get the necessary licenses to operate them (you're selling items so you need to get sales licenses and whatnot from your state), buy the machines and a truck for the items in the machines, find a supplier of the products, and then finally you can secure locations. Finally, you need to service them periodically or hire someone to service them.
Because passive investors’ rentals are viewed as secondary income, they can only deduct the normal costs associated with their rental properties. They cannot deduct any home office expenses and are limited on how much they can deduct from any losses they might incur. As of 2010, you can only deduct up to $3,000 from your other active income like your job or employment.

In most cases, all rental real estate activities (except those of certain real estate professionals, discussed later) are passive activities. For this purpose, a rental activity is an activity from which you receive income mainly for the use of tangible property, rather than for services. For a discussion of activities that aren’t considered rental activities, see Rental Activities in Pub. 925.
I just wanted to say how nice it is to see such a positive exchange between strangers on the Internet. Seriously, not only was this article (list) motivating and well-drafted, the tiny little community of readers truly were a pleasant crescendo I found to be the cause of an inward smile. Thank you, everyone, and good luck to you all with your passive income efforts!! 🙂