There is no reason, in fact it is essential, that you write about your self and what you have done and do - sell your self.
There is no doubt that selling on Ebay has a lot to do about selling your self, making it the best possible experience for the shopper no matter what you are selling. Making the shopper happy with buying from you, trusting you, goes a long way to selling your goods and services.
I speak as a professional website designer. I too am very new to Activa and setting up shop, but having been around for a very long time and experiencing so much you tend to notice the out of kilter errors and omissions