youll probably want to learn all 12 major and minor open chords. where you start doesnt matter but starting with some easy chords first will help build your comfort in playing. a few id recomend are EM and Em AM Am GM CM DM Dm BM Bm FM Fm(if you didnt know major is captiol M minor is lower case m).
some of those can be difficult but are do able with practice.
you can also start learning the Barre Chord forms when you learn how to play the shapes for the 5th and 6th you can move the chord any where on the root string so learning one chord is like learning 12 chords. then youll beable to 'fake' most pop music.
the second
if it looks like the pros are moving one finger at a time its because they are. as you learn and practice more youll learn short cuts inbetween chords. Am and EM are the same 'shape' but Am is a string higher. switching between CM and Am is very easy you only really need to move your third finger. give it time and youll get it. as you practice more youll notice your keeping your fingers closer and closer to the strings. just like when you learned how to type on a computer.
third
finger style and using a pick i think come down to preference. i use a pick most of the time because my fingernails grow funny and playing on finger tips doesnt give me the 'attack' i want. the only guitar i almost always play finger style on is my classical.
a good finger style player can almost always blow a picker out of the water in certain styles of music. music like the blues, bluegrass, country, classical, some classic rock. metal guitar usually needs a pick because of the fast alternate picking on single strings and leads.
if you can learn to play both ways, that way if you find yourself with out a pick you can still play, and you always have fair enough technique to try something new.
and never forget to play the guitar, forget about the theory and the scales and how to build chords and just play now and then.
They say the END is near, but I'm Tired of waiting.