Once you’re familiar with the gameplay of The New Ars Moriendi, you may want to run a game in the setting. You can follow a sample scenario from this page to get right into the game without prepping everything by yourself.

Money in the Bag (Player: Introductory / GM: Beginner+)
A bank robbery from either perspective. Usable to kick off any campaign in the setting. This one-shot is bring-your-own-city, so be aware of that before you try to run it on short notice.