Since you're new to it, it's really important that you test ride many different road bikes at your local bike shops.
If you end up with the wrong size, or even the right size but not right for you geometry, then it could ruin your enjoyment of cycling outside.
Ordering one on the internet isn't recommended if you're inexperienced.
If you're trying to save money, performance bike or rei have decent deals on house brands and liberal return policy.