pick where you wanna start say with an arpeggio, then had in some other chord tones from it and some scale tones with even some non-scale tones(the best place to through these wouldb be like a 7h8h9 where 8 would be the non scale, so you dont stop dead on it but pass by it, which would also be a passing tone) then if you think its to simple go back and through in the passing tones and or neighbor tones to fill it up a bit, these are just some simple things you could do really but its a start

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