To do that you can use an existing picture as a starting point. Here's an example, I want to draw an old fashioned handsaw.
Here are the steps you need to take.
Find a suitable picture on the internet and copy it to your slide.
Use the drawing tools curve and free form to trace the outline of the objects. Click Insert - Shape - Curve/Freeform. Once you select a tool your cursor will change into a plus sign, click to have an anchor point, move the mouse and click again, repeat the process and end by clicking at your starting point. No need to do it with 100 % accuracy, later on you still can change the drawing points if needed.
Our handsaw requires 5 shapes. For shape one and two you need the curve drawing tool. For shape 3 and 4 you need the circle. For shape 5 you need the freeform tool.
When you are finished remove the underlying picture, just select and delete it.
You already have a reasonable picture. In part two we will refine and spruce up the drawing further.