The biggest problem with working at home is that many of business ideas you are given by the Internet are scams. There are hundreds people out there living off nave beginning businessmen. You don't have enough money for helping them buy new cars and villas - and even if you had, you would probably prefer fetching some luxurious stuff for yourself. What does it have to do with the envelope stuffing? Let's read more about it below...
What you will be paid for - Do not believe in miracles. If you find an ad claiming that you can get $2 per each envelope you stuff (and you can easily stuff 20-30 envelopes per hour), be sure that there is a catch. I mean, what would be the point of going to college or working for years to become a senior manager in a corporation if one could get an easy and relaxing job for $40-$60 per hour? Most usually, such offers include two catches. First, they require a high upfront payment for the stuffing equipment. Then, you learn only too late that you are going to get paid $2 per envelope only if the person who received the letter actually converts. If he simply throws away the ad you prepared, you get nothing. To make long story short, you can get around $4 per hour maximum - and only if you are lucky and send interesting ad letters. You can easily work for days without receiving a single dollar. This is always written in small print in the agreement so you won't notice it only when it is too late.
Openness - Any legitimate business which wants to outsource envelope stuffing will tell you exactly who they are and what they do. While they may keep some details secret, they tell you exactly how much you may earn (exactly), and what it takes to actually do it right. If they fail to do so, and that's the case with 99% of envelope stuffing opportunities, it means that their offer is trash. Especially if you are asked to buy their starting kit in order to learn more, turn back and walk away. You are only a few steps from losing a few hundred dollars for nothing.
Warranty - While all businesses are risky, legitimate companies always issue some warranties or assign some minimal payment you receive regardless of the conversion rate. That's how real legitimate business is done. The point is that there are virtually no envelope stuffing companies which offer minimal payments or any other guarantee.
To sum everything up: There is virtually no such thing as a legitimate envelope stuffing business. It's that simple. Look elsewhere, there are plenty of legitimate businesses to associate with.