Hi Shoukei,
You do need a website for CJ.
I think your online download service can be a good niche. Few things you need to address:
1. How long it takes for the same person to come back and download something else? This is where your repeat sales come from.
2. How frequent the contents are updated so that there are new downloads for your visitors?
3. How much is per download and how much you earn per download?
4. Do you personally download the contents?
Hope that helps.
