Veggies are not my strong suite so I can't help you there.
A fattie is a one pound sausage chub - you know the kind - Jimmy Dean, Bob Evans etc that you would slice and try for sausage patties.
You take it out of it's plastic wrap, and in it's purist form you just toss it on the cooker till it's about 160 degrees - about 2.5 - 3 hours. Some folks like to give it a rub dust and some like to stuff them and enrobe them in a bacon weave. All are delicious. I would encourage you to try a naked fattie at least once to get a feel for the wonder that is a fattie.
BE WARNED - NEVER, and I mean NEVER cook just one fattie. You will be sorry.