Alright. So I am a tall(ish) female college student in north Texas who is looking for a bike. For the most part at my school the streets are smooth with small to medium sized hills.

I am looking for a bike but I know very very little about bikes. I read something else saying something about a mountain bike with city tires would be preferable for college? I know what a mountain bike is but I don't know what city tires are. I went on target.com and they had a lot of huffy bikes. Are they decent bikes? Would I be better off going to a bike store? Anyone know any good ones in the DFW area?

Help?