Puppies are like babies...is a commitment you have to be ready for. It takes much love, care, time and patience to raise them and it can be exhausting. They also need time to adjust and to learn and apparently you too since she's your first pup...me too
Make her feel loved, give her treats when she does something right...positive reinforcement every time!
For me doing research has helped a lot since its easier when I know what to expect.
Good luck with your new puppy! I hope he warms up to you.