Hello getting a puppy

I'm getting a puppy in about a month and It's been about 9 years since I've had a dog I've gotten two leash two collars the food bowls,tags , tooth brush and some toys also well as canned pumpkin I plan getting more toys before she comes home as well as a playpen , a dremal ( they and pee pads grind your dogs nail) I'm aware that puppies are a lot of work and I'm willing to make sacrifices to make this workout

Ok I'll jump to the point what are some advice / things that people don't often tell you when your getting a puppy