Get a method book on classical guitar (eg. solo guitar by fredricl noad ) and get lessons
Yes, and here's a good reference: http://stason.org/TULARC/musical-instruments/classical-guitar/
yes. and vice versa. so if you're buying a guitar, and you're planning on playing more acoustic songs and some classical, pick a steel string. and the other way around.
Clasical is easier on your fingers (but in my opinion, acoustic is richer in sound quality) but they are both as hard as eachother If you want to learn, here are some nice chords that you can...