Don't use a ds that charges a joining fee. A recent survey showed that the majority of web sites for ds are simply cons, so do extensive research. Best to deal in high value items for a decent profit. Goodluck
Be careful - many people will not buy from a drop shipper.
And as you would be ordering the goods in small quantities, when you actually sell the goods, it is possible for the buyer to get the goods cheaper direct from the supplier.
Look at any item on ebay from a drop shipper - google - and I bet you will get a better deal from a large company that offers extras such as free p&p.
The margins are very tight - those ebay and paypal fees add up.