Hello, as a professional Freelance I have a big experience for this job, i read your description and i can start right now and see your opencart site.
The price is indicative and you will need to give me more information.
I have made many works and you can see more to my online portfolio: https://www.freelancer.com/u/peleytheriou?w=f
I'm interested to hear more about the project and about the subject matter of the lectures.
If you award me the project I'd be very happy to discuss this further and get started for you as soon as possible.
Regards,
Panos Eleytheriou