Help needed to create online learning platform

Description

I'm trying to launch an online course but finding the design tricky. I have a logo and brand colours. I've identified a couple of possible platforms but need a designer to make them look good and to provide me with idiot proof instructions on how to upload content once it looks the business. I need it to host at least 5 courses, videos, downloadable workbook , end of course quiz, evaluation form and downloadable certificate. I also need to be able to take payments.