InfoPath Dev

The list i'm trying to create will actually have two values . In the top section if you select full time an employ number will need to be entered. If you select contractor it will prompt you to enter a date. I tried to see if I could create a listbox with two different conditions but dont see how that is possible.   Full ...

 Hi, I'm new to created forms in infopath.  I have a list with check boxes. I'd like the form set so only one check box can be selected. What would be the best option to complish this?    Full Time             ...