Hi Serdar and welcome to the forum
1. Suppliers may be able to send products to Turkey, however you will have to check with the supplier you want to use to confirm that.
2. Dropship suppliers ship directly to your customer, then invoice you for the product and shipping cost
3. No such thing as average, it all depends on the supplier so you will need to discuss with them directly
4. Actual shipping time will depend on the supplier so you will again need to discuss with them directly
5. Once again, this is something you need to discuss with suppliers directly
6. In regards to percentages, you will need to research the market for that answer. You need to know what your competition is selling at, then
measure that against what you are buying at and that will give you a basic equation.
7. Yes, SaleHoo subscription is charged annually.
8. Integration with eBay, this is something you would need to discuss with the supplier as to if they make pics and anything else available to use.