We got a puppy when I was heavily pregnant. Did a LOT of research on breeds, socialising, training, diet, approximate costs etc. So pleased we got a dog but they are a lot of hard work. If you can commit to puppy and training classes, being at home for the first couple of weeks, puppy proofing your house, dog care for when everyone’s out for 3 hours plus and holidays, play time and home training and generally giving a dog the attention they need, plus cover the costs (food, insurance, any dog walking, toys, treats etc) then definitely consider it.
We set alarms at 3 interspersed times overnight to do toilet training in the early days which worked brilliantly, although obviously tiring.
Walk wise even for active dogs puppies only need a tiny amount when they’re growing so no huge romps while they’re little. Conversely dependent on breed even on the most hectic and rainy of days you need to factor in a decent walk for them.
Our dog is such a huge part of our family but they are a huge responsibility. They learn so much of their behaviour in the first weeks so puppies that are handled and socialised at the breeders (along with their mum of course) and see lots of different scenarios once home fare best (stupid things like hats, trains, busy roads etc).
You may find more help over in the doghouse section of mumsnet. What breed are you thinking?