To address all important parameters to maximise your potential of success when launching an app, an interesting checklist to follow:

https://branch.io/resources/app-launch-checklist/#plan&

The benefits of hiring a Senior Executive in your startup…

http://business.lesechos.fr/entrepreneurs/management/pourquoi-moi-start-upper-j-ai-embauche-un-dg-de-58-ans-300687.php

Thank you Serena Capital for this complete panorama:

The Ultimate French VC List

Read this article to structure your commercial storytelling:

The Greatest Sales Deck I’ve Ever Seen

By the way I believe Zuora is an amazing company. I met them while at L’Oréal, they offer a great service to enable anyone to manage innovative business models (subscription, freemium, etc.).