Hope this isn't in the wrong place. If so you can throw things at me.

Anyway, I was thinking about starting to read the manga, but there are a few questions that I have before and or if I choose to do so.

1. Does the anime follow the manga's storyline?
2. If yes, where would I pick up within the manga (ie. what volume/chapter) where the last episode of the anime (ep. 111) left off?
3. Is it truly going to be a good investment to purchase this manga? This is just out of curiousity, since I am not made of money, and the only other manga I've purchased is Death Note. Which I considere to be a wise choice. I'm just wondering what your opinions are, or if I should just be patient and wait for the anime to continue.

I'd appreciate a little help as I have no idea myself.