Congo:
For starter, if you are new to music everything will look complicated but first and foremost, if you are serious about learning music, just ask a question. For example, if you are trying to play a fast song slow, of course the chords are not going to sound the same. Its like reading theory and you play by ear. But if you keep trying it will click and come to you. Like anything else you practice.
My advice to you would be to first learn all your scales then move onto chords in each key.
KEY MAJOR SCALE
C = C D E F G A B C
F = F A G Bb C D E F (1 flat)
Bb = Bb C D E F G A Bb (2 flats)
Eb = Eb F G Ab Bb C D Eb (3 flats)
Ab = Ab Bb C Db Eb F G Ab (4 flats)
Db = Db Eb F Gb Ab Bb C Db (5 flats)
Gb = Gb Ab Bb Cb C Db Eb F Gb (6 flats)
B = B C# D# E F# G# A# B (5 sharps)
E = E F# G# A B C# D# E (4 sharps)
A = A B C# D E F# G# A (3 sharps)
D = D E F# G A B C# D (2 sharps)
It goes back to C. This is actually the Circle of 5ths. If you want to practice a song print out Hallelujah or Thank you, Lord (something slow that you know the melody to.)
Just my advice.
Joy