Can anyone help me?

I've been making my own jewellery using silver plated findings and wire etc for some time now. I use this type of silver as its a cheaper practice alloy, simply as that.
However I would now like to start selling my pieces more mainstream as I feel I'm now good enough using sterling silver wire and findings etc, but not sure how much more I could change per item? I'm a goos designer and makiner, but I lack knowledge in these areas suchas pricing and in particular marketing. Do buyers prefer cheaper silver plated stuff or the higher quality of sterling silver??? Should I invest in a website or stick to fairs???
I personally would prefer my own jewellery in sterling silver, but guess it depends on my market, which perhaps I need to really identify.

Any help/advice would be greatly appreciated.

I'm interested in hearing from anybody, after all if we're not jewellers then we are consumers!