Before you start drawing you should warm up your muscles, eyes and brain. Start each session by drawing groups of around 20 lines
Horizontal, vertical, at 45 degree up and 45 degree down.
Then put groups of 10 dots on your paper and try to draw lines that go through those dots
We will spend time looking at the various methods of showing 3D objects in 2D. Check out the Drawing section of this site for more.