Well done, Reily
. You've grasped the basic principle, but the real difficulty with perspective is not to understand the basics ("further away looks smaller
") but to get a gut feeling for it. Practice, practice, paying attention.
ALL parallel lines that do not follow "the plane of the paper" converge to a VP. Of course, if very slight, you can ignore it, but definitely not diverging
You are also correct on the second principle, all VP's lie on the only Horizon Line or EL. BTW, there is no need to put the EL in the same position as in your reference / scene. As a matter of fact, the knowledge of perspective is crucial in changing the EL when combining several references with different viewpoints, to arrive at a consistent picture.
The assignment of the table and / or chair is checking your understanding of the third basic principle. If not yet done, I'd advice you to look at post #365, page25.
Keep up the good work