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Key: D Major

I ii IV I

I: D Major ii: e minor IV: G Major I: D Major

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    Welcome to Music.SE! Your question is a little broad right now and may get closed because of it. Is it possible to distill your question into a single specific problem? What have you tried? – Richard Jun 4 '18 at 1:05

One easy way to make melodies from a chord progression is to use chord tones. Using your example, an I ii IV I progression in D would make use of these chords:

D e G D

Whose notes are:

(D, #F, A) (E, G, B) (G, B, D)

You could just write a melody picking from the tones from the chord you're writing over. Using this example:

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To further spice the melody up, you can vary the rhythm and add melodic decorations such as passing tones, anticipation notes, and auxiliary notes.

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This can be done with any chord progression. For more about melodic decorations, see this website.

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