CAD rule #1: Always draw everything actual size.
Type settings and enter to get to the grid settings.
Use the scale command to change the size of an object. Type scale, select the object, and enter a scale factor. 2 will double the size, .5 will make it half size.
Do you know how to draw accurate sized lines?
Say you want to draw a line from coordinates 1,1 to 3,4.
First, you click the line button, then type 1,1 and hit enter. Now, you have two ways to get to 3,1. Absolute entry or relative entry.
To use absolute, just type the coordinates and hit enter. 3,4 (enter)
To use relative coordinates, you use @. To get to 3,4 from 1,1, you need to move2 along the X and 3 along the Y. So using relative coordinate entry, you type:
Here's how it looks in ProgeCAD:
Command : _POLYLINE
Start of polyline: 1,1
Arc/Distance/Halfwidth/Width/<Next point>: @2,3
If you're drawing horizontal or vertical lines, toggle Ortho mode with F8.
In Ortho mode, it's easy to use direct coordinate entry. Say you want to draw a line 5 inches to the right. Click the start point, drag the mouse to the right, type 5 and enter. The line will be 5 inches long. This works at angles too, but it's hard to get an accurate angle that way.
To draw lines at angles, use relative input with < for the angle. A 3" line at 45° would be @3<45.
Model vs Paper.
You do all your drawing in model space, and use Paper Space (Layout1, Layout2....) to set up drawing pages for printing. Even though you draw everything to actual size, Paperspace will let you print multiple views at different scales on the same page.
Stick to model space for now, you still have a ways to go.