First, you should have knowledge about the demand of customers.
You should know that which products are purchased more and which ones are rarely bought.
Electronic items are mostly purchased in large numbers by a lot of customers.
Therefore, it is always safe to include gadgets like iPods, DVD players, GPS devices and mobile phones in the list of products you would sell on eBay.
Keep an eye on newspapers and different online stores for getting a hint about the demand of people.
Second, mind your language when you reply your customers on eBay.
You should understand that customers are very important for the prosperity of your selling business.
Customers always love to buy different products from trustworthy sellers.
Therefore, if your customers face any type of problem in getting the products purchased by him then you ought to reply him in the most polite way.
The more courteous and polite you will be, the more successful seller you will become on eBay.
Third, in some cases the goods delivered by eBay never reach the customers.
In such a situation the customer will surely be very angry.
What you should do is to offer replacement or refund to such a customer.
If you will not do this then the customer will leave a negative feedback for you on eBay.
As a result of this, you will suffer as a seller on eBay.
You should understand that the feedback of customers is very important.
If you will offer excellent services to your customers, new customers will also buy various items from you.
Fourth, if after making a sale, the customer says that the product which is delivered by you is not similar to what he saw in photographs on eBay then you should refund him.
Even if you know that the customer is grumbling, you should do this.
It is always better to ask the customers about their feedback by yourself.
Do not give a single chance to your customers for complaints.
Fifth, always try to be honest in this business.
Never add wrong description of products for selling them.
By conning people you can make money for one or two times but later on you will not be able to exist in this business.
If you are among those people who want to be a big player in this business then you have to understand the importance of customer satisfaction.
Also, representing a product in a nice manner in photos is acceptable but do not try to fool the buyers.