For that matter, you may wish to ask yourself why you want a dog at all, because what you'll have is a bored, destructive barking machine. If you want security, get a burglar alarm and you won't have to feed it, take it to the park, scoop poop or pay vet bills. Most Corgis have a high energy level. Bred to herd sheep, Corgis need physical activity. If you don't have the time or energy to provide a reasonable amount of exercise, consider a less active pet.
Puppies are a lot of work, because they're babies.
If there's no one at home to take care of a puppy, consider an adult rescue dog. If you do get a puppy, crate-train it. Used properly, crates are not cruel. Dogs are den animals and love these safe places to relax and sleep. Crate-training is the fastest way to a housebreak a dog and makes it easy to keep them safe when they're ill or need to travel.