How to create a Blueprint template

I’m a beginner and I need help to create a Blueprint which has the combination of different templates and customise existing Templates and save to utilize in multiple projects.

Thank you in advance.

There is an existing Confluence Blueprint tutorial with sample code, but it is very outdated and will not run without extensive modifications.

I have worked through the problems with the official tutorial, and I created a functioning demo app. The multi-page blueprint demo app for Confluence is available for free in the Marketplace. Please evaluate it, and if you have any requests or suggestions, please submit a support request.