Selling on eBay is a really important way to make a living. It is a sign of the times because people are moving their shops to digital spaces rather than paying rent for commercial spaces. Digital spaces are pretty much always going to be cheaper than commercial spaces which is why going for them can make financial sense for you, and at the same time you can organize your work processes in such a way that making the most of your day to day routine will be much easier than it would have been otherwise.
You should really focus on developing a good reputation on eBay though if you want to find a proper amount of success. Your reputation is the only thing that would make it possible for your products to sell with any real sense of regularity, and chances are that no one would be willing to buy from you if your rating is not good.
Now, your main priority is probably going to be getting a good rating and reputation, and in order to do so what you need to work on is delivering products on time. There are lots of problems with postal services but you shouldn’t delay sending products out and what’s more is that you should make sure that all of the products you have sent out are being sent to the right recipients rather than going out to someone else. If you want to sell on ebay with Salehoo you should know that sending the wrong product to someone is a surefire way to get a low score and after a few low ratings you will find it more or less impossible to start selling on eBay in a sustainable way.