You'll find that everyone has their personal preference regarding shoes/pedals. That's why there are so many brands. I think many beginners have good luck with Shimano or Look pedals. I started on Look, it's a good platform so that even if you have trouble clipping in, you still have some security to pedal if you have to get yourself through an intersection or something.
I think if you are going to do longer rides and not a lot of walking, I would go more roadish than mtn bikeish...your feet will feel more supported.
Whatever you get for shoes, just make sure they fit well, that is what will matter most. The pedals for now will mostly be a matter of getting used to it.
2011 Cannondale CAADX 105
2012 Jamis Dragon 29er
2012 Jamis Xenith Endura Comp