First; be sure that you chose a company with products that work.
Second; the products must be consumable, month after month, year after year.
Third; the company is financially sound and is in good legal standing.
Fourth; the company’s management is experienced and knows what the heck they’re doing.
Fifth; there is a vast market that wants and/or needs the product.
Sixth; the compensation plan is straight forward and understandable so that you can easily decide what the return on your investment in money and time really is.
Seventh; you can believe in and be passionate about the products and company.