Hi Debi,
At first InfoPath can be tricky. You want to select controls from the taskpane and add them to the canvas. But as you expand your knowledge you might find that it's easier to design the data source first, and then design the canvas. So, for example, if you know you're going to want some fields in an optional section, then you can create a group in the data source, and create the fields as part of that group. In the data source, then you can:
1. Put the cursor in the canvas in the position where you want to insert.
2. Right click the node in the data source and select the control you wish to use for this node.
Obviously, not everyone works in InfoPath like this, but at least for me it's easier to plan/organize the data source first, and then "translate" that into the canvas. Good luck!