My $.02...The girls are going to love it because it came from YOU! Especially since they know you're not a die-hard scrapbooker like some of us addicts! For your first time, keep them somewhat simple, use stickers and die-cuts and sayings with each picture, you don't need fancy backgrounds and expensive paper! It's comin from the heart, and it's the pictures and love involved that are going to be the most important!
HAVE FUN!
P.S. And I can't wait to hear about you becoming a scrapbook addict very very soon!