Build an Online Training Website

This project is for a online training website to be hosted in India. Need an economical website for online training with payment gateway (Paypal & PayUmoney) integration. Home page design has to be light but highly impressive, may include flash. Website will contain the usual tabs and most pages will be static. Website will need to have free downloads and a embedded demo video. The website will not host any content, once the user makes a payment, a partner api should generate the login credentials for users. Rest will be managed by partner site. The website should be customizable by non technical users. The website design will be used to host multiple micro-sites separate for each topic. Developer needs to develop only one such site, the rest of the customization would be done by me based on the content. The website needs to be responsive. I am not a web development expert so I cannot tell you what backend/frontend to use, however I would want a new opensource platform that can be easily hosted on commercial shared linux hosts like [login to view URL] or the likes. What i am trying to say is that all integration has to be from basic offerings by service provider. No additional costs to be incurred. Most importantly my budget is limited. I can spare a maximum of INR 5000/- for this project. People with experience in similar projects or someone who already has created a solution and can customize it to my requirement with minimal effort would be ideal.