As usual, Atlassian has very good documentation on Blueprints:
https://confluence.atlassian.com/conf59/blueprints-792498905.html
The page includes a link to the Blueprint writing tutorial.
https://developer.atlassian.com/confdev/confluence-plugin-guide/confluence-blueprints/write-an-intermediate-blueprint-plugin
Does this answer your question? (I really recommend using the web site "google.com" btw.)
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