I would suggest just trying to get one county's worth of data programmed. That way you have an easier time of it with the other counties.
We have an extensive user guide in our wiki - you can get to it via Help/Online Help in FS, but if you're not familiar with how DMA works, it would make little sense to you. I would start with the Easier to Read manual and our FAQ - those will be your biggest helps in getting started.
Hopefully you've already also gotten a USB cable and done the driver installs - and made sure you've gone through the menus in the 996XT to set up the ports.
If all this sounds new (or you need the links to all of this), go here...