A couple questions for airplane?

Hey guys. I know I've asked a few questions before, and while I am a frequent flyer, I haven't flown since last summer & I have a couple questions. I've heard many different things on this, but I got my Amazon Kindle for my birthday in April & I was wondering if I'm aloud to use it? I've heard a couple things about the screen getting wiped out while on the plane? Two, in the past few months my lips have been getting chapped easily & I have to use chapstick everyday...will the airplane make it worse? Three, I'm truly afraid of take off. I know it's normal & not dangerous or anything, I just have always been to the point where I grab onto the arm rests & SQUEEZE them. Is there anything you recommend to help me not freak out so much? And lastly, I'm flying Southwest Airlines (love them!) and I'm considered an adult now. I have to find my way through the terminal to baggage claim at the Tampa International Airport.. Is it easy to find or confusing? I looked at the maps and they weren't very helpful. It's just going to be me & my 9 year old brother.. Sorry this was so long, thanks in advance!!!