1. Flamenco is a Spanish guitar style. Finger picking with strumming. Very precise finger patterns.
2. That is correct if it is the most comfortable way for you to do it. Nothing is written in stone for guitar playing. Go through the basics here.
Brand new to playing the guitar?...read this first.
Brand new to playing the guitar?...read this first. - Guitar For Beginners & Beyond Forum
3. There are many ways to finger the same chord. It depends on your comfort level as well as where you are moving to next in a musical passage.