Many people would say that even thinking about starting a business with no money is foolhardy. They would say that trying to do it for free means that it's not a serious undertaking. However, there may be times when "free" is almost the only option.
There are many people who are desperately short of money, and for various reasons can't, or don't want to, have a "normal" job. These people need a way to almost create cash from thin air - "Money for Nothing", as the Dire Straits song goes...
These days, there are actually many possibilities for making money with the help of a computer and the internet. If you're creative, you may be able to sell your own work online, and build up some income that way. Or you may have some skills you can sell as a freelancer, even something as basic as typing.
The majority of marketers on the web are probably "affiliates", who basically sell things for a commission. It's a very low-risk sales model, as you normally don't have to purchase the products in order to sell them. If you are active on social media, then you may be able to make use of your popularity to sell via those accounts. Or you could get paid to post advertising on behalf of other people.
The business of affiliate marketing involves finding products, and then getting "traffic" - you need plenty of website visitors in order to make a sale. Products can come from Amazon, Clickbank, JVZoo, or maybe the Warrior Forum. There are probably thousands of sites where you can find things to sell for commission.
It can feel like you're groping in the dark when you're just starting out and trying to find a product that might sell well. You have to bear in mind that you need to spend a lot of time creating free advertising if you don't have any cash available. Sometimes you can spend many hours surfing and clicking on sites, signing up to new advertisers, and trying not to go round in circles too often!
I recently found a couple of systems that can give you some clear guidance, some useful income, and will also work very well together. If you click here, you will be taken to a description of the first one - an autoresponder that can act as part of your long-term business system. And this one should start getting you some cash in a couple of weeks - about $180, with no recruiting or sales required.