Hi
I'm a beginner, but in my last class my tutor told me it should be subject first in sentence structure and to try and imagine you are creating a film or picture for the other person. For example:
Car black drive = I drive a black car
Horse man jump on ride = A man jumped on a horse and rode away
So you would probably sign "fish you like"?
I'm not sure how you would sign the difference between want and like but I'm going to ask in my next lesson as it is a good question.