What if initial side of an angle starts from the left? How to know if it's positive or negative

So we just started studying trigonometry and I don't know anything yet except the DMA thing which our math teacher taught us in class a while ago. But anyway, my question is what if the initial side of an angle starts from the left? Does it have the same concept if the initial angle starts from the right? (I mean, if you go counter-clockwise, it's positive. If you go, clockwise, it's negative) Or do people not draw an angle which has an initial side starting from the left?

Please use the quadrant diagram to understand the angle. Divide the cycle into four quadrants or x-axix and y-axis. On y-axis Horizontal line where x-axis perpendicular line intersects is 0 degree. Now looking at left side of the quadrant all angles moving clockwise starting from 0 to 90 then 180 and the 270 then 380 completing cycle are positive... whereas if you start anticlockwise moving downward all agles will be negative

consider an angle in the II or III quadrant on a unit circle (one to the left by your terminology), lets pick 135 degrees (going counter clockwise), its an angle in the II quadrant, we know that this is also the angle 225 degrees (going clockwise).

Since, 225+135 = 360 degrees

You are right
if you go counter-clockwise, it's positive. If you go, clockwise, it's negative