Jon, you should do your home work before signing-up to a drop shipping service. In my opinion, first thing you should do is - define a product group/niche you want to sell in. Otherwise, it will be very difficult to what what you're looking for, as you don't know exactly what you're looking for :-)
If you're new to selling on eBay, I wouldn't recommend dropshipping concept in the beginning. Start selling some cheap stuff which you can by in quantity for a few quid per piece. Build your feedback score and experience, and then look into dropshipping opportunities.