In terms of your trading status, I would register as a sole trader, at least for the time being. I would also say VAT registration should be avoided until you meet the threshold or your business plans predict that you will undoubtedly do so. It keeps things simpler that way.
You can still have a company name as a sole trader, but it won't be quite as official as a Ltd company nor will you get any form of registration number.
If you're going to be doing business in China you'll soon learn that money talks. They really will not give a second thought as to whether you're a Ltd company or sole trader, VAT registered or not. Really that's not going to be an issue (a different story with many UK suppliers however).
The cost of a website varies, it really depends what you're looking for. Personally I would budget £500 - £1,000 for a decent e-commerce site.
As for using a dropshipper to pad out your store with more products, this could work quite well but personally I would focus your efforts on those 3 - 4 products and then expanding your range over time.
Last edited by PT; 18-06-2009 at 11:52 PM.