If you're new to CorelCAD, you should take a look at a series of tutorial videos that walk you through the 2D and 3D design application step by step.
Here's the first video tutorial, introducing the user interface of CorelCAD:
In the playlist you will find 5 additional tutorial videos, covering these topics:
2. The CorelCAD cursor
3. The menu bar
4. The command window
5. Working with tool palettes
6. The coordinate system icon