Free web host aren’t the best idea if you plan to run a successful long term business on the internet. With free web hosting your site isn’t guaranteed to be up and running, and many free host erase sites after they been running for so long, that it’s self is bad.
If you work to promote your free website, all that work will be for nothing when your site is erased, all them back links they mean nothing when there’s no website. Another reason why you wouldn’t want to build a website using a free server is because of the domain name, you don’t get to pick your domain name with free server, it will be www.whatever.freehost.com instead of www.whatever.com. I think the Internet world gives more respect to a website that’s got a good domain name.
There are always opportunities on the Internet, whether you promote your own product, you promote other’s products through affiliate programs, whatever your intent is upon building a website, I highly recommend you using a paid server.