Hi Jerry A,
You must use inches.
You'll want to use absolute coordinates. It helps to make a sketch ans write down the measurements in inches.
For wxample, let's assume you want an L on the left and the layout is 8' x 12' and 5' wide. So, the 96" x 144" x 60".
The first entry would be 0,0. Click on the green + sign. That creates that point.
Then decide which direstion you would like to work. Let's make the L on the left first.
Next would be 0,96 + sign
60,96 +
60,60 +
144,60 +
144, 0 +
0,0 +
click done.
You could also create a 32'\384" x something rectangle. Then you select the bule line and it will turn red. Place the cursor at a location and right-click and select add a point. Then you can select that point(solid red) and click and drag it. Add as many points as you need. The location is indicated in the low left, by x,y coordinates and the length that you moved it.
If you want to give me the dimensions, I will create the baseboard for you and post the file, so you can work on the track.