This job is for Ukranian wordpress experts only, others please excuse.
Need to convert existing html5 files to a fully functional wordpress site. The site is about selling online training videos for customer and should work like this :-
1) Customer chooses a training module and places the order through paypal.
2) A login id and password is generated and sent to the customer.
3) He logs in and play the online videos.
All functions must be widgetized and should be incorporated above the basic WP. Future upgrades of WP or any other plugins should not hinder the operation of the site.