For the first part, we will create a simple voltage divider circuit.
Start CircuitMaker. It should open up with a blank canvas. To add components you can either browse through CircuitMaker's catalogue, or search by the part's name, number, or description. The buttons for these tasks are found at the toolbar at the top:
We now add a voltage source to our circuit: Source > Linear > VSource. Note that you can specify values and hot keys in this window. Checking the return box will cause this part selection window to automatically re-open after you've placed the part on the canvas.