Using Bonita Application builder >> How to simply start a new case for a given process (simple POC page, with "available actions" for creating new cases)

I designed several process using a set of simple actions.

I would like to propose a simple application page - built with Bonita application builder - listin these actions so that the "users" would have a "splash screen" for initiating different process or do simple actions that would trigger new cases to be created.

I found examples for external application that would create cases and manage a lots of things using the rest api, but it was targeted to java application, and I'd like to stick with the new bonita 7 application builder (lots faster for simple things)

Many thanks in advance for your help!
Lionel.