I agree with everyone who suggests starting with the hybrid bike. That is what I did. I want to mention some additional benefits and that is you will build muscle density faster on a hybrid because it is heavier than a road bike. My LBS told me that the 20 miles I pedal on my Trek Navigator 300 is equivalent to pedaling 40-50 miles on a road bike.

You move up to the road bike when you strongly desire to ride that 40-50 miles, not the mere 20 miles, and at higher speeds. If you are starting at base zero, it takes awhile to get your fitness level up there and for some people, they will always prefer their hybrid, but for others, they progress from the hybrid to the road bike when they really want to pedal more miles and are capable of doing so.

Darcy