1. You need to make a decision. Here's one way to sift through all the confusing data:
http://www.sloperama.com/advice/m70.htm. If you've tried it and it didn't help, try it again.
2. No.
3. Read
http://www.igda.org/games-game-september-2009
4. You can get un-confused if you just break all the info down into bite-size chunks and examine them one by one, then gather the data into a decision grid. If that doesn't help, please explain why.