Well, first don't blindly listen to people. I see so many bad advices here, and everywhere on the web. Who exactly told you FB customers convert poorly? Seriously, the few things that you CAN'T sell on FB is probably stuff like heavy machinery, medical equipment, and niche things like this.
Also, no matter what others tell you - 6 months is a lot of time, but you wasted it trying methods. These methods are open, and when they appear at first, tons of people are trying them, and only few get success. Continue reading, and try imagining how everything works together, seriously these methods will rarely do the job well.
As others pointed - start selling something cheap so you can buy domain, hosting, etc.
Here is a working method - get a domain and hosting, and open a website in a very big niche, preferebly expensive one. Start selling services, memberships, affiliate offers, something to make you money from your visitors - multiple options here. Now start and promote your website by any means you can. From forum posting to ads using coupons, talk to people, social media, guest posting, find partners in that niche who can send u traffic and cut the profits, and work your way up.
good luck, you gonna need it!