Just make sure you get the right size frame for you, a good bike shop will measure you up , and , "fit" a bike to you. It makes a world of difference. And get the lightest one you can afford, a few grams here and there does'nt sound like much, but, when your pedelling it around those few extra grams feel like kilos
Shoes are very important too, get a good strong shoe that has little to no flex, and fits like a glove, you can play around with where the cleats mount on the bottom of the shoes, once again, a good bike shop can start you off in a good position, and then you can adjust as you ride around a bit to fine tune that.
All the best, welcome to the saddle sore society