#2
Generally chords come first then lyrics.

It's easier to sing lyrics in key of a chord/song then it is to add a chord/song in the key of how the lyrics are sung. (Not "needed" but to me it just sounds better if they compliment eachother)




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#3
how will i do that... is there a thing that is called family of chords beacuse i hear it from other people. sorry for my bad english
#4
Look up "major scale" and learn how to construc it.

For example, the C major scale consists of the notes:

C D E F G A B

Chords, consist of notes. Example, the C major chord:

CEG

Those notes, fit in the scale. Therefore the C Major chord is in the key of C.

You can do that for every chord, find the notes and make sure they fit in the key. < long way

Learn music theory.




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