Stay clear of ebay mate!
Many moons ago we had several shops selling canvas art and poster in ebay and amazon we were turning over serious amounts of money, enough for ebay to be inviting us to special events anyway….
The thing was as each year went on our margin decreased and prices got cheaper we were selling more and not making the same amount of money. Eventually it got to a point where we were just turning over cash each month!
From past experience take your time to build a good solid core range of products that are high quality and you can charge decent money for.
I would say with wallpaper you want to be getting atleast 25.00 per Sqm….
Don’t even try and and compete you do t want to be known as the cheap guy as cheap is not always sustainable!