How do I make my rails site a business

I’m currently coding day and night hoping to make something out of my
web project. Once I’m done with it, what would be the next step?
Google ads? At first I wasn’t even thinking about “business” but now I
see that It can be.
Once I’m done with the app, I’ll be sure to mention it on here.
Basically, I’m just asking for some ideas on site promotion, how do
you guys and gals do it?

Maybe this is better asked on quora [1] or some other [2] startup
discussion site? Not really a rails question, per se.