Dimensions: 1st and 2nd

Okay, I'm going to try and explain this as best I can. From everything I have read and watched I will try to make it as simple as possible.

Lets start with the 1st dimention. This is a very easy one to imagine. This is just a point, it has no sides or dimension, it is just an imaginary idea that represents a position in a system. Then a second point can be used to indicate another position. Now if we join these two points it becomes a line and this is how we create the 1st dimension, there is only length, no width or depth. Still following me so far?

The image on the line you would not be able to see, it 

is for imaginary purposes only.

Okay so that was easy. Now the 2nd dimension. In the 2nd dimension there is only length and width but no depth. If we were to live in the 2nd dimension, when we view a person or object we would only see one side, if the person or object was to turn the side we see by 90 degrees it would be impossible to see, it would still be there but because there is no depth it would like nothing is there. (Imagine a playing card rotating)