I don't personally know the platform you mention, so I can't really be of much help with how to actually get it done. Experience has taught me that while a basic site on these type of platforms is often possible, something special takes a little more efort, as you seem to be also finding on this occasion.
I would be getting my design down on paper first, just so I had a good idea with what I really wanted the site to do and feel like. From there you will have a clear picture in your own mind and you may well find it a lot easier.
If you are struggling for a design, I suggest you hot sites like templatemonster.com. Check out templates, they may well get your creative juices going. I've designed quite a few sites over the years, and have spent many hours looking at website and templates to generate ideas, and its never failed me yet : )
Talk to them about the design issues you are having, they may well be able to assist.
In regards to eBay, I think eBay is worth its weight in gold, website or not. Many people choose one or the other, but you can use them both to maximise your efforts.