Don't use your hands to play with her, that can make her mouthy which can cause some scratches or bites (most likely not intentionally biting, but it hurts when they get older!) Always use toys to play so she learns that toys are for playing, not hands. It's very important that you teach her this since she has no siblings and she's only 7weeks. This time period is crucial for her to learn good doggie manners. Take her to basic obedience classes that use positive reinforcement as a training method. Also make sure she gets a good high-quality diet as it will help improve her health. Get her spayed sooner rather than later. Don't wait til she's 6 months old as she may go into heat before then, ideally she should be spayed before her first heat, so I would say about 4 months old should be ok. Also, if you're in an area where there are mosquitoes, she should be on monthly heartworm preventive as well as flea/tick treatment. Don't get the stuff from the store, get a brand from your vet as those are safe for dogs.
Also, I would encourage crate training, it will make housebreaking 100 times easier as well as give your new puppy her own space to feel safe and to get away from the kids when she doesn't want to play anymore.