Hi, Welcome to PC!
I'm actually on Lexapro. My first time on an antidepressant as well. It's pretty good. It's a lot more concentrated than it's cousin drug Celexa, but apparently has less side effects.
The first few days are a little miserable, until you get used to it (I had dry mouth, bland taste to food, nausea, dizziness... basically all typical symptoms).
I have noticed a slight weight gain, which is typical for an AD. Besides that though, I love it. It works really well for me.
http://psychcentral.com/meds/lexapro.html