Hi, I'm kinda new to this Mac thing as I've never personally owned one before..but I've used them quite a bit in college (who knew so many students would have mac's hah) and I decided to pick one up for myself later this week. I just had a few general questions: 1) When you first get the Mac, are you supposed to charge it before you turn it on? 2) Is it ok to leave it plugged in almost ALL the time? It'll be on my desk for the majority of the day so just wondering if that would be bad for my battery. And is it cool to keep it plugged in even when it's sleeping/off?