I have questions about music? I have to compose music with the following (UNDER DETAILS)?

Can someone tell me about: a) A clear form – ABA/AABA/ABACAD How many measures can I compose for each letter? b) Use of a chord progression with only I/IV/V chords If I use B flat (major) for my key signature, how do I make a chord progression? c) Melody that has a symmetrical design with a clear call and... show more Can someone tell me about:

a) A clear form – ABA/AABA/ABACAD
How many measures can I compose for each letter?

b) Use of a chord progression with only I/IV/V chords
If I use B flat (major) for my key signature, how do I make a chord progression?

c) Melody that has a symmetrical design with a clear call and answer component. A clear development of a harmonic progression.

I still cannot distinguish harmony and melody! How do I make harmony if I play with one instrument?
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