Hi!
I spent two thousand dollars on adwords and got zero sign ups. I did this pretty much to A/B test two landing pages, obviously I couldn't get any useful data of it because no one signed up. Also, it was my intention to get a couple of users help us improve the app.
Even though I founded a startup before, it wasn't a web app and we physically reached potential customers. That said, how does a web startup can get someone to signup without reaching to them individually?
I think you did get useful data:
Spent two thousand dollars on adwords and got zero sign ups
With that, now you have to figure out why. There are two paths to explore:
1) Your product doesn't meet the needs of the market. It's not useful/valuable. 2) Your messaging doesn't properly communicate the value of your product to the market. So they couldn't understand why they'd need/want it and left.
Figure out which one of those is the case (could be both!) and keep marching.