How to set up paid membership area

Hi everybody,

I am trying to figure out how to do the following structure:

1. Paid memberships. After paying for a fixed term (1 or 2 or 3 months) a member logs in to a member area
2. In the member area there are options to upload music files (mp3 or wav)
3. All visitors can browse the music files and download them after payment

The last part is quite clear - just setting downloadable products in the control panel. However, I cannot figure out how to set up (if possible at all) the first part - i.e. paid memberships with possibility of uploading files.

I am quite comfortable with PHP programming but do not want to invent a wheel, if something is ready. Are there embedded options to make this in zen cart? Any other solutions?

If I have to make my own code, what is the easiest structure - do it as new EZ pages with cross links to each other?

Please, give me some guidance

Thank you

Andy