Everyone in the campaign is a Chicago survivor, so they will use the same system that I used in the beginning for starting with a fraction of total hp. Roll 1d50+25 and that is the percentage of hp you are down. E.g. rolling 36% means you lose 36% of your total hp. It has been a day since the blast, but no one has really had a chance to rest.
Graybeard, someone with a military or police background would be a good idea. Alternately someone with a criminal background would work just as well. Basically, the group will need someone who can shoot a gun. We had a couple at the beginning but the players of those characters had to bow out for different reasons. A character with a medical background would also be extremely helpful. At present we have characters with technical/mechanical knowledge, interaction skills and ethandrew's character brings some athletic skills into the mix.
Felix1459, you are welcome to join. That will bring us up to six which is a good number. I might consider adding one or two more if the character concepts bring something unique to the group.