This is the advice given with response to Chiefy's post
here
I draw a basic recatnagle in Plan view, than draw by clicking and drawing straight lines with the line tool (pencil icon), and curves with the arc tool (semicircular arc). To help draw consecutive and flowing shapes, Google has been your friend. when you go to draw the next line using either tool, there will be green nodes.
If using the arc tool, this node will provide a light-blue smooth transisiton between the arc and the preceding item. If using the line tool, the node signifies that if you drag in a preset direction (indicated by a line that has turned a nice shade of pink), the angle is the perfect angle given how the straight operates.
Another nice way to draw a circuit is to use the line tool over and over again to complete the shape. After cong so, click the arc tool, select a point, then drag accross to the following side until the line turns pink once it has, drag the mouse in the direction of the sharp corner until until the pink arc is achieved before deleting the extended tangents to the arc.
One last thing, Avoid the freehand wherever possible. it's a mare to deal with it, and is only really useful on smalle scale models.
I hope this helps.
Regards
Tathrim