What is Good Luck Charlie about?

"Good Luck Charlie" is a show about a little girl named Charlotte (Charlie) and her family getting use to having another little child. I think it looks pretty good! I kinda wanna see it.
The Cast:
Teddy- Charlie's big sister *main character* (Bridget Mendler)
PJ- Charlie's older brother (Jason Dolley)
Charlie - the newest member of the family (Mia Talerico)
Amy- Charlie's mom (Leigh-Allyn Baker)
Bob- Charlie's dad (Eric Allan Kramer)
Ivy- Teddy's friend (Raven Goodwin)
Gabe- Charlie's older brother (Bradley Steven Perry)