I'll answer the second question first.
If you purchase in wholesale lots, that will have to be sent directly to you and then you can sell the items individually from there. You do need to make sure the products you purchase from DH Gate are not branded products. Any branded product will be a fake and will end up getting you into trouble when trying to import.
When dealing with a B2B site, you need to always use a safe payment method as well, never use a wire like Western Union.
Regarding Dropshipping, When listing the product on eBay you have to list the location as where the product is coming from. So if you live in the US, but the product is being sent from China, then you have to list the location as China, not USA where you live. The location is for where the product is, not where you live.
Enough with the Master lol, I'll be getting called Yoda soon :(