I feel like giving a good pitch of the game, including it’s feedback loop, it’s very important and it’s something often forgot. Yes, blades is about building a gang and doing heists, but saying that only conveys part of what the game is trying to emulate. Make sure to explain how the game is always trying to cut to the action and create dramatic pulls. How Blades is all about jumping into danger without a plan and dealing with the unintended consequences of that. How there is a build in circular sctructure of Finding a target > Doing the Job > Gaining/Spending Money > Finding Another Target and so on.
Besides that, I think all you need a little pacience to get the ball rolling with all the different mechanics the system introduces, I feel like 3~6 sessions is the usual time people start to understand how the game works and really embrace the chaos.