Moving an InDesign course to WordPress

Hello everyone!

I have a course I designed as an interactive PDF with InDesign. I have it set up as a full-screen experience, with buttons to click through the pages, links to audio and template files, and fields to fill out.

The course is sold through multiple sub-licensing organizations, and I have one massive file with alternate layouts for each organization's branding.

I'd like to move the course online, mostly to provide a mobile-friendly experience. I'm trying to get some background on my best course of action. 

Questions I have:

• Should I create the pages in separate files for each organization, creating alternate layouts for views for desktop and mobile experiences?  
• Would it be easier to copy and paste each lesson in a post on WordPress?
• Can my paragraph and character layouts map to CSS?
• Am I in over my head and about to embark on a disaster? 

Thanks for any help!

Can my paragraph and character styles translate to