#1-Do you know if they take just my NCSU undergrad work alone of if admissions takes an average of all college work? I have about a 3.0 if they take the average. Regardless I realize this probably disqualifies me from the T14 schools.
LSAC will calculate your GPA based on all college courses taken before receiving your Bachelor's. So your community college work and NCSU work will both be counted.
#2-I know some schools require a statement on why I didn't complete a legal program. I was enrolled in a Paralegal program but did not complete it. Actually it is part of the reason I decided to go to law school. But the reason I did not complete the program has other circumstances as well. Would it be a good idea to explain these circumstances in an addendum?
Well, if they require an explanation then you have to provide one. I don't think any of the schools I applied to required me to explain programs that I hadn't finished, though. If you are in fact required to explain, be completely honest and succinct. I seriously doubt if the fact that you didn't finish a paralegal program will much (if any) effect on admissions.
#3 I'm starting to brainstorm on my personal statement. To make a long story short, I am thinking about writing about my depression and what I learned from it.
This is a deeply personal topic, and only you can decide what to write about. That said, in my opinion it is best to steer your essay towards strengths rather than weaknesses. I know that writing about how you overcame an obstacle can highlight your personal strengths, but it almost seems a little too personal for an essay topic. Just my opinion.