That is some great information and I thank you for that!
It was also suggested by the guy who sold me the bike that if I really get into riding it, the wheels should be the first upgrade. He's one of those who has a bike shop to fund his bicycling habit, not to get rich and retire young!
It does have the centerpull brakes which I think will be fine after we upgrade the brake pads and make sure they are adjusted properly. I will also take your seat suggestions to heart (or to butt!) ... thanks for that.