Do you live in an area that has bikes for rent? Riding a bike around the block a couple of times may not be enough to tell you how the bike feels. Once you have bike type down, road, comfort or MTB, you can then narrow the style, relaxed diamond tourer, speed bike, fix gear etc. I anticipate that I will go through several different handle bars trying to get my riding position to be comfortable for me, and that my position will change over time. I will start out with old man albatross bars and later move to a more tucked position.
This is what aI went through to decide to buy my bike and get back into riding. I am still waiting for the bike to arrive. The last thing that helped me was knowing that if I got good parts I could move them to another frame later on.