[karcey]

G'day Siyun, Welcome to the forum.
Everyone has a different approach, I frequently change my mind about the best approach for me because I don't progress as fast as I'd like. I've tried a few teachers and a mile of books. Problem is the books don't know what I really want to play, so they generalize. I pick the bits that apply to me, I'll get to the other stuff later.
I think the best tonic I've ever experienced was learning to play a song. Maybe some would mock, but to hum a melody over even just two chords is a real achievement. My finger style was boosted by nursery rhymes. Who cares if they're simple ... at least they're as musical as some of the modern popular songs.
There's much about theory, chords and scales in the books. My belief is that you should learn it only as you need it. Then you don't forget it. If you learn one hundred chords up front, I'll guarantee you won't use more than a third of them, and when you need one you'll have forgotten it anyway. Learn the scales and chords to fit the song you're learning now, then you won't forget them.
Follow Carol's advice and visit here frequently. Browse through the old posts and read the ones that interest you. Ask about the things you're working on, and don't be shy... we know you're not a guitar player yet, but we hope we can help you become one.
Keep in touch.