You need family camping. Parker's Creek does not have a reservation system for the family camping sections they are all first come and first serve. The rest of the camp grounds around the lake you'll need reservations. However, you can go to the NC Parks website and reserve them there. It is pretty easy.
However, in the past year or so they have really pushed the reservation system. Most of the other state parks are really recommending that you pre-reserve a site. Most of the time the camp grounds are not full and you can get a site if you just show up, but it is pretty easy to go and reserve a site. But you can't really do much if you don't know what sites are the good ones and you never know what neighbors you're going to have.
Love Jordan Lake. We have stayed quite a bite at Popular Point(Reservation Highly Recommended) and now have started going to Parker's Creek. I don't like Parker's Creek as much because of the stumps that are off in the water, but if your not boating it isn't that bad. Parker's Creek is a much slower and less crowded camp ground compared to the others.
Let me know if you have any questions my wife and I have spent about 10 weekends just the year at state parks.