What to pack for spring break?

I'm a 13 year old girl and me and my 14 year old brother are going to Arizona over spring break. We live in Indiana. Me being a teenager, I *always* forget something really important, then when we are on the plane or in the car I'm always like "CRAP!" Haha, so I need a list! I'm going to be there for a week. It'd be amazing if you could give me a list of items I need for the plane ride, clothes, personal items, etc.. Also, the liquid thing confuses me, and what is a carry on bag & what can I put in it? Thank you!