Hi Vallentin,
Unfortunately, there are a LOT of us who list digital papers, which means, organically, its going to be very hard to get a shop to show up in the searches.
Somethings you can do to help your shop out however are:
1. List more than 10 items. The more items you have, the greater the chances of you being found
2. Get involved in cross promotional games in the teams and forums
3. Research and follow best SEO practices for your titles, content and tags
4. Just keep at it - it takes time and work to build a strong presence, but its very possible.