Some troubles looking for a writing commission to fix the story I have. Is it too expensive for my budget? How to ensure I find someone who will produce quality work?

I'm now looking for someone to help fix the random details I have into a coherent story (I guess I'm looking for a story outline or story design document or something along those lines?). I also want to fix the characters I have too I'm having trouble searching for people to do this though, prices ...