Originally Posted by Spek
So will a retail store really be helpfull.
The folks in bikes shop both ride bikes and work on them all the time. If you don't feel comfortable with the first person you see when you walk in the door, the service manager or store manager can answer all your questions.
Another thing to consider getting once you build up the miles is a decent pair of bike shorts. A good saddle (not too soft) and a good pair of shorts make all the difference in the ride.