If you have children, you need to consider that. Some of the best dogs with children are Labradors and Golden Retrievers. Dalmations and Pitbulls would not be a g ood choice. They tend to be very temperamental. The next things you will need to do, is decide if you want a male or a female.
Females are generally calmer and easier to train.
They also do not tend to urinate everywhere because they don't need to mark territory. Males, tend to be aggressive toward other males, but can be very affectionate also. You should also spay and neuter you dog. Spaying is for females and neutering is for males. Fixing your dog with stop them from having puppies and make them less aggressive.