Create new pages and add widgets to pages dynamically

What's the goal of this functionality? Based on what these pages will contain, you can achieve this with the content and application model: create 30 content (forum thread, blog post, wiki page) and then have a directory (application) page with a list of the content pages. You could create the application and content programmatically with out of the box content types, or a custom content type.

Hi   Now I can try with content pages with application.

Can you help me what are interfaces to create content pages from application. Can you provide any sample please? Thanks!

I'd recommend you start with the Developer Training on the Content model:  The Content Model 

And then check out the examples on creating custom apps and content:  Creating Custom Applications and Content

This will give an overview of the interfaces to implement and other ways to integrate into our existing model for handling content and applications.

I'd recommend you start with the Developer Training on the Content model:  The Content Model 

And then check out the examples on creating custom apps and content:  Creating Custom Applications and Content

This will give an overview of the interfaces to implement and other ways to integrate into our existing model for handling content and applications.