In order to be successful at any business, you need strong support and solid training. The law requires MLM companies give you a slew of information, including financial details about average income. Study this and ask questions. If the rep is hesitant to answer or glosses over your concerns, he's not someone to work with. A legitimate MLM company wants you to be informed 
But more than product selling MLM/NM provides a lucrative option to earn great part/full-time money and most importantly passive income. Once you sign up somebody in the business by selling a product and he signs-up someone else and so on, you create a network of people who are recommending a product or offering a business opportunity thus generating sales for the company and also earning 10-125 of the total sale happening through your network. In MLM u get percent of every sale that happens in your group of people directly (when u personally sell to someone) or indirectly (your team member sells to someone). So, if you have a network of 10 people and your team sold product worth $1000 then you would earn $100-150 as commissions. For direct sale u get more money.
MLM is basically a Multi-Level Marketing. It is a kind of marketing structure where the product or service flows on Word of Mouth publicity and most of the companies avoid advertisements when following such structure. Advertisements requires a huge some of money which in turn raises the cost of the product but there's no change in quality whereas the amount which was supposed to be paid to the advertisers and middle men or distribution channel is distributed among the distributors of the company.
What you want to watch out for are "fast track" programs or pressure to have inventory that requires additional investment. Due to this practice, the law now requires MLM companies to buy back inventory, but that doesn't mean you want to be saddled with debt before you start and truly understand the business. Having a few popular products on hand can be nice, but don't fill your garage with products unless you know for sure, based on your experience in the business, that you can sell them.
Much has been made of the personal, or internal, consumption issue in recent years. In fact, the amount of internal consumption in any multi-level compensation business does not determine whether or not the FTC will consider the plan a pyramid scheme. The critical question for the FTC is whether the revenues that primarily support the commissions paid to all participants are generated from purchases of goods and services that are not simply incidental to the purchase of the right to participate in a money-making venture.[46]
The legal distinction between MLMs and traditional pyramid schemes has been characterized by many authorities as a legal fiction. Jurisdictions that retain a legal distinction between MLM pyramid businesses versus illegal pyramid schemes retain said distinction on two key distinguishing features: 1) that MLMs always encompass the sale of actual products/services, while traditional illegal pyramid schemes ordinarily do not (though sometimes they do), and 2) that climbing an MLM pyramid is overwhelmingly statistically improbable (especially to its highest participant levels) but not theoretically impossible, whereas climbing a traditional illegal pyramid scheme is both statistically and theoretically impossible.[citation needed]