How do I know there is a Soul ? ?

A colonoscopy is a procedure to examine the inside of your colon (intestine) with a scope. A scope is a flexible tube with a small light and camera on the end. Look for the answer there.

Your soul is, effectively, your inner "real" self as opposed to your outer personality, how others see you. In some people they are very similar - what you see is what you get. But most of us tend to hide and protect our real self, except, perhaps, to our very closest ones. Hence so many people feel misjudged and misunderstood. 

All shoes have souls. 

There isn't one. It's just what people tell themselves for comfort when thinking about their own mortality and the deaths of their loved ones.