Help center api

I want to create a zendesk support app. And want to use help center api's. I want to create knowledge base app. I have read the documentation https://developer.zendesk.com/api-reference/help_center/help-center-api/introduction/ but till now can not understand how can I start with this. If anybody have already created this type of app please let me know. 

it will very helpful for me!!

thanks