When you are going to be gone all day long, and the dog has to be left alone, or (even worse) crated all day; then it is just not a good environment for any dog, especially a younger one, and for sure not for a puppy.
Most people think that they want to start with a puppy and raise it themselves, and this is not easy, even when you are there at home all day.
I think that an adult cat would be the best selection for you at this time; but if you are set on getting a dog; then I would suggest a small breed senior dog.
The small breed is probably used to spending most of the time inside, and maybe even used to being left in there alone. An older dog won't need or want as much exercise, and they can happily snooze all day long when you are gone.
My Yorkie-poo, Chipper, is eleven years old now, and he is very content to just relax on the couch when I am gone.
Another thing you might do is try fostering a pet, and see how it goes having a dog in the house. Most pet shelters need foster care for pets until they can be adopted out.
That way, if the dog works out well, you can adopt it, and if not, you only need keep it for a short while until it is adopted by someone.
