I would go with a mtn bike but put some smooth tires on it since I'm guessing you will mainly be riding on the road. Buy some good shorts so your butt doesn't hurt and you may want to start out with standard pedals but look to moving into some clipless ones down the road. Good luck.
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"I always rode to my limit. If I won by three minutes, that's because I couldn't make four."
Eddy Merckx
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