There’s no need to be an artist, just an expert in some form of art. Visit galleries. Get on their email lists, and go to their parties. Get to know their clients. Gallery owners will love you, even recommend your services, because you’ll be telling people to buy art from them. You don’t have to own any inventory. It’s pure consulting. There is almost no overhead cost for a business like this. It’s really about having a passion for art and a knack for earning people’s trust. And it’s fun!
You’ll have to decide for yourself when to “formalize” your company by creating a legal structure like an LLC, buying liability insurance, and such. For advice on these matters, you can meet with volunteers at SCORE, and there are even places to get inexpensive legal help. Meanwhile, why not pull out a $100 bill and take a look at what you can do with it.
Often, what happens is that we run into unscrupulous Internet Marketers (IMs) who have less-than altruistic intentions of extracting money from you rather than helping you to make it. However, this isn't something new. People have been falling for networking marketing, pyramid schemes, and affiliate marketing scams since before the start of the net.