My advice is similar to David's. I'll just take it a step further.
The most important thing you can do, if you're serious about it is to arm yourself. That may sound a bit dramatic ... and well it is. But it's always important to remember that people who are writing to you about working from home likely using some predictable marketing techniques.
They are trying to reach a certain type of person. In the end what that means, is that the offer that feels least suspicious to you is actually the offer directed at you.
Besides that, see right through anyone that offers a quick fix. Hey it's not impossible, but there's no road map you can follow to quick fix/easy money. There are just too many variables. Working from home takes effort and dedication. But it can be done.
Feel free to write to me if you need an experienced and honest opinion.
To your success,