introduction

I know what colors make a room feel "warm" and "cold". I know how to place furniture in a room so it can look bigger than it really is. there are a lot of textures you can use also shapes and lines. I chose this topic because I took a class on Interior Design and I liked it and I would like to have it as a career later on.
The first question I got is when it all started like the history on it?
The second question is why people would need their own interior designer?
The third and final question is if I would like to be an interior designer after I do this paper.