Hello!
Welcome! I'm also a newbie - one month old. :-) When I FIRST started out...on my old bike - I did 1.2 miles on the first day. Then progressed to 5 miles...and let me tell you, I was EXHAUSTED. I couldn't *wait* to get my hands on a decent road bike. My LBS had a great sale, so I bought my first ever road bike. It took a little while, but I'm now doing 8 miles to 17 miles. Your miles get build up pretty quickly. It also helps a lot if you join a group ride, or beginner's ride (my beginner's ride is 17 miles!).
Love the pictures on your blog...i'm jealous. Where I live - all I see is houses, stores and casinos (Las Vegas).