[1] https://flask-restless.readthedocs.org/en/latest/quickstart....
Else, I might be partial to do it in something like Rails that would allow me to write almost 0 lines of code, instead just spend time connecting various gems, libraries, etc and make a push to Heroku and get a proof of concept up.
While Proof-Of-Concept is running (free on Heroku) I would probably spend time rewriting it in Python or if you become partial to Ruby, just sticking with it...
One of the favorites for Rails would be Michael Hartl's guide to rails. It's easy to follow, free, and quite extensive.
When you start actually building something, theres a collection of videos called 'railscasts' and theres a video for just about any topic in rails you can imagine.
For example deployd is open source AFAIR; others (like Firebase, Parse) are hosted solutions. But overall they all give you instant CRUD over your data. In your case, their turn-key multi-user capabilities are a bonus.