What most people say is just make sure the bike fits. A good local bike store (LBS) will work with you to find a good fitting bike. With hills, something with a lot of gears is good. You might want to think about what you want to do with the bike. Ride to see how fast you will go?? (usually a road bike is good for that - and some have an upright position) Just out for recreation and don't care how fast? (A comfort bike is good for that as well as a hybrid) Will you ride roads, dirt roads, single track?
Have fun trying out a bunch of different bikes before you buy!! And welcome to TE!!!