If you get a puppy and go to puppy classes, often offered at pet stores (sometimes for free), you could probably do well with almost any breed. However, some dogs do require more attention than others. Jack Russell Terriers for instance are very active and need something to occupy their minds and plenty of time outside to run around. Border Collies need lots of outside exercise and Poodles need stimulation of the mind as well. Don't misunderstand, all dogs need a certain amount of time, attention, love, and exercise but some need more than others. Do some research on the breeds you're interested in before selecting one. Some breeds have reputations for being aggresive and you will need to establish quickly that you are the Alpha dog in your family and that the pup is the low man on the pole so to speak. If you're selecting a puppy a good rule of thumb is to lay the pup on it's back cradled in your arm. If the pup relaxes and lays there with it's belly exposed it most likely has a good temperment. If not it may get snappy as it gets older.
Also, keep in mind that pets are expensive. They need regular medical attention, in addition to emergency medical attention. They need food, and toys. Yes toys are needed. They help with teething and save your furniture and shoes as well as stimulate the dogs mind. Dogs are a lifetime commitment just like children. Once turned into a pet they won't know how to fend for themselves if abandoned. It's a cruel and heartless thing to do so if you can't to committ 12-18 yrs of care you may want to consider getting a fish instead.
The best advice I can give is to: Research, research, research.
Good luck and enjoy your new family member.